LG 27GL850-B Monitor Review

Tested using Methodology v1.1
Updated May 01, 2020 at 10:29 am
LG 27GL850-B Picture
7.8
Mixed Usage
7.8
Office
8.2
Gaming
7.7
Multimedia
7.8
Media Creation
6.8
HDR Gaming
Size 27"
Resolution 2560x1440
Max Refresh Rate
144 Hz
LCD Type
IPS
Variable Refresh Rate
FreeSync

The LG UltraGear 27GL850-B is a very good 1440p monitor. It has an outstanding response time, quicker than most 144Hz monitors we've seen so far. This results in exceptionally clear motion in any scene, with almost no blur behind fast-moving objects. It also has outstanding low input lag for a responsive gaming experience. This monitor supports AMD's FreeSync variable refresh rate (VRR) technology, and it's also NVIDIA certified as G-SYNC compatible, so VRR works automatically with recent NVIDIA graphics cards. Unfortunately, like almost all IPS monitors, it doesn't look as good in dark rooms, as it has a disappointing contrast ratio and poor black uniformity.

Our Verdict

7.8 Mixed Usage

The LG 27GL850-B is a very good monitor for pretty much any use. It's a great gaming monitor, with outstanding response time and extremely low input lag. It has wide viewing angles, good peak brightness, and good reflection handling, great for office use or watching videos with a few friends. It delivers a decent HDR gaming experience, but it's limited by its low native contrast and poor black uniformity.

Pros
  • Outstanding response time.
  • Wide viewing angles.
  • Excellent low input lag.
Cons
  • Disappointing contrast ratio and poor black uniformity.
  • Limited ergonomics.
7.8 Office

The LG 27GL850-B is a good monitor for office use. It has wide viewing angles, good peak brightness, and good reflection handling. It has a decent height and tilt adjustment, but it can't swivel, which might be an issue for some people. However, it has excellent gray uniformity, which is important for browsing the web or opening documents.

8.2 Gaming

The LG 27GL850-B is a great monitor for gaming. It has outstanding low input lag, a great resolution and size, and outstanding response time. It supports FreeSync, and is NVIDIA G-SYNC compatible, and it has a flicker-free backlight. Unfortunately, it has disappointing ergonomics, and it doesn't look as good in a dark room due to its low contrast ratio and poor black uniformity.

7.7 Multimedia

Overall, the LG 27GL850-B is a good monitor for multimedia. It has a great resolution and size, and wide viewing angles, so it's well-suited for sharing videos with your friends. Unfortunately, like most IPS monitors, it doesn't look quite as good in a dark room, as it has a disappointing contrast ratio and poor black uniformity.

7.8 Media Creation

Good monitor for media creation. The 27GL850-B has a great resolution and size, so you can see more of your work at once. It has great viewing angles, good peak brightness, and decent reflection handling. This monitor also has outstanding low input lag for a responsive desktop experience. Unfortunately, it doesn't look as good in a dark room, as it has poor black uniformity.

6.8 HDR Gaming

The 27GL850-B is decent for gaming in HDR, mainly due to the great gaming performance. It has a very low input lag and an outstanding response time, so fast-moving objects are extremely clear, with almost no blur behind them. It can display a wide color gamut in HDR, but unfortunately, it can't get bright enough to bring out highlights.

  • 7.8 Mixed Usage
  • 7.8 Office
  • 8.2 Gaming
  • 7.7 Multimedia
  • 7.8 Media Creation
  • 6.8 HDR Gaming
  1. Update 6/4/2020: We retested FreeSync over HDMI, and updated our results below.
  2. Update 2/17/2020: Converted to Test Bench 1.1.

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Video

Test Results

Design
Design
Style
Curved No
Curve Radius Not Curved
Weight (without stand)
9.0 lbs (4.1 kg)
Weight (with stand)
13.2 lbs (6.0 kg)

The 27GL850 has the same look as most other LG UltraGear monitors. It's mainly black with a red circle on the back, but it doesn't illuminate like the 32GK850G.

Design
Stand
Width
18.9" (48.0 cm)
Depth
9.4" (23.9 cm)

Like the 27GL650F, the stand supports the monitor well but still wobbles a bit.

5.9
Design
Ergonomics
Height Adjustment
4.3" (10.9 cm)
Switch Portrait/Landscape Yes, Clockwise
Swivel Range N/A
Tilt Range -15° to 5°

This monitor has disappointing ergonomics. It has a decent height adjustment and it can rotate to portrait orientation, but its tilt range is limited and it can't swivel.

Design
Back
Wall Mount VESA 100x100

The back of the monitor is very similar to other UltraGear monitors. There's a quick-release on the stand, but only very basic cable management through a clip attached to the stand.

Design
Borders
Borders
0.4" (1.0 cm)

The bezels are very thin on three sides, and they aren't very distracting.

Design
Thickness
Thickness (with stand)
6.5" (16.5 cm)
Thickness (without stand)
2.2" (5.6 cm)

The display portion of the 27GL850 is thin, and looks great VESA-mounted. Even when mounted on the stand, the setup doesn't stick out much.

7.0
Design
Build Quality

The 27GL850 has decent overall build quality. The outer casing is almost entirely made of plastic, but there aren't any obvious points of concern.

Picture Quality
5.5
Picture Quality
Contrast
Native Contrast
735 : 1
Contrast With Local Dimming
N/A

The 27GL850-B has a disappointing contrast ratio. Although IPS monitors usually have low contrast, this is worse than most, and blacks appear gray when viewed in the dark. If you're looking for a similar monitor but with a VA panel, displaying deeper blacks, then check out the AOC CQ27G1.

0
Picture Quality
Local Dimming
Local Dimming
No
Backlight
Edge

This monitor doesn't have a local dimming feature. The above video is provided for reference only.

7.8
Picture Quality
SDR Peak Brightness
SDR Real Scene
315 cd/m²
SDR Peak 2% Window
346 cd/m²
SDR Peak 10% Window
346 cd/m²
SDR Peak 25% Window
346 cd/m²
SDR Peak 50% Window
347 cd/m²
SDR Peak 100% Window
347 cd/m²
SDR Sustained 2% Window
346 cd/m²
SDR Sustained 10% Window
346 cd/m²
SDR Sustained 25% Window
346 cd/m²
SDR Sustained 50% Window
346 cd/m²
SDR Sustained 100% Window
347 cd/m²
SDR ABL
0.000

Good SDR peak brightness. It remains consistent with different content and there shouldn't be any issues overcoming glare in a bright room.

6.4
Picture Quality
HDR Peak Brightness
HDR Real Scene
341 cd/m²
HDR Peak 2% Window
361 cd/m²
HDR Peak 10% Window
362 cd/m²
HDR Peak 25% Window
362 cd/m²
HDR Peak 50% Window
362 cd/m²
HDR Peak 100% Window
391 cd/m²
HDR Sustained 2% Window
322 cd/m²
HDR Sustained 10% Window
313 cd/m²
HDR Sustained 25% Window
306 cd/m²
HDR Sustained 50% Window
316 cd/m²
HDR Sustained 100% Window
361 cd/m²
HDR ABL
0.010

Unfortunately, the 27GL850 has mediocre HDR peak brightness. It can't get bright enough to show off small, bright highlights in HDR content.

Note: While trying to measure the HDR real scene peak brightness, we encountered a bug, and the monitor started to flicker. We don't know why this happened, and we didn't encounter it with our other HDR tests.

8.4
Picture Quality
Horizontal Viewing Angle
Color Washout From Left
45 °
Color Washout From Right
45 °
Color Shift From Left
51 °
Color Shift From Right
51 °
Brightness Loss From Left
48 °
Brightness Loss From Right
50 °
Black Level Raise From Left
70 °
Black Level Raise From Right
70 °
Gamma Shift From Left
58 °
Gamma Shift From Right
55 °

The 27GL850 has great horizontal viewing angles, which is expected from an IPS panel monitor. The image remains accurate when viewed from the side.

6.8
Picture Quality
Vertical Viewing Angle
Color Washout From Below
32 °
Color Washout From Above
33 °
Color Shift From Below
33 °
Color Shift From Above
39 °
Brightness Loss From Below
37 °
Brightness Loss From Above
39 °
Black Level Raise From Below
70 °
Black Level Raise From Above
41 °
Gamma Shift From Below
31 °
Gamma Shift From Above
31 °

Decent vertical viewing angle. The edges of the screen are darker if you sit close to it and you lose image accuracy if the monitor is mounted above or below eye level.

8.5
Picture Quality
Gray Uniformity
50% Std. Dev.
3.149 %
50% DSE
0.120 %
5% Std. Dev.
0.382 %
5% DSE
0.060 %

Excellent gray uniformity. There's some very slight vignetting, and a bit of dirty screen effect in the center, but neither of these are very noticeable with normal content.

4.8
Picture Quality
Black Uniformity
Native Std. Dev.
2.831 %
Std. Dev. w/ L.D.
N/A

Unfortunately, this monitor has poor black uniformity. There's noticeable backlight bleed and clouding throughout. This might vary between units, so let us know if you get a unit with better black uniformity.

7.4
Picture Quality
Pre Calibration
Picture Mode
Srgb
Luminance
182 cd/m²
Luminance Settings
100
Contrast Setting
70
RGB Controls
Custom (50-50-50)
Gamma Setting
Mode 2
Color Temperature
6442 K
White Balance dE
3.57
Color dE
2.46
Gamma
2.15

The 27GL850-B has okay out-of-the-box color accuracy. There are a few noticeable color errors and the color temperature is extremely close to the 6500K target. Gamma doesn't follow the target curve well, though, so most scenes aren't displayed at the proper brightness.

9.6
Picture Quality
Post Calibration
Picture Mode
Gamer 1
Luminance
99 cd/m²
Luminance Settings
14
Contrast Setting
68
RGB Controls
50-50-50
Gamma Setting
Mode 2
Color Temperature
6438 K
White Balance dE
0.53
Color dE
0.62
Gamma
2.17

After calibration, this monitor has outstanding accuracy. Colors are displayed almost perfectly, and any remaining inaccuracies aren't noticeable.

You can download our ICC profile calibration here. This is provided for reference only and should not be used, as the calibration values vary per individual unit even for the same model due to manufacturing tolerances.

9.2
Picture Quality
SDR Color Gamut
sRGB xy
99.6 %
Adobe RGB xy
84.2 %
sRGB Picture Mode
Gamer 1
Adobe RGB Picture Mode
Gamer 1

This monitor has an outstanding SDR color gamut. It can display the entire sRGB color space used in most content. It also has impressive coverage of the wider Adobe RGB color space, great for professional photo editing.

9.3
Picture Quality
SDR Color Volume
sRGB In ICtCp
97.1 %
Adobe RGB In ICtCp
88.9 %
sRGB Picture Mode
Gamer 1
Adobe RGB Picture Mode
Gamer 1

Outstanding SDR color volume. It's mainly limited by the disappointing contrast ratio, as it can't display dark, saturated colors very well.

7.3
Picture Quality
HDR Color Gamut
Wide Color Gamut
Yes
DCI P3 xy
77.8 %
Rec. 2020 xy
68.4 %
DCI P3 Picture Mode
Gamer 1
Rec. 2020 Picture Mode
Gamer 1

The 27GL850 has a decent HDR color gamut. It has good coverage of the DCI P3 color space used in most HDR content but limited coverage of the wider Rec. 2020 color space.

6.8
Picture Quality
HDR Color Volume
DCI-P3 In ICtCp
75.5 %
Rec. 2020 In ICtCp
61.1 %
DCI P3 Picture Mode
Gamer 1
Rec. 2020 Picture Mode
Gamer 1

Decent HDR color volume. It's limited by the low native contrast, as it can't display the full range of colors, and can't display dark, saturated colors very well.

10
Picture Quality
Image Retention
IR After 0 Min Recovery
0.00 %
IR After 2 Min Recovery
0.00 %
IR After 4 Min Recovery
0.00 %
IR After 6 Min Recovery
0.00 %
IR After 8 Min Recovery
0.00 %
IR After 10 Min Recovery
0.00 %

There are no signs of temporary image retention on the 27GL850, even immediately after displaying our high-contrast, static test image for 10 minutes.

9.7
Picture Quality
Gradient
Color Depth
10 Bit

The 27GL850 has outstanding gradient handling. Any banding isn't noticeable with most content.

9.8
Picture Quality
Color Bleed
Pixel Row Error
0.001 %
Pixel Column Error
0.048 %

There's some extremely minor vertical color bleed, but this isn't at all noticeable with regular content.

7.7
Picture Quality
Reflections
Screen Finish
Matte
Total Reflections
4.8 %
Indirect Reflections
2.7 %
Calculated Direct Reflections
2.1 %

The 27GL850 has good reflection handling. It performs best in rooms with moderate amounts of light, such as most office environments.

7.0
Picture Quality
Text Clarity
Sub-Pixel Layout
RGB

Text clarity is okay. It can be improved by using ClearType (top photo), which makes the diagonal lines on the letters R and N clearer.

Motion
9.3
Motion
Response Time @ Max Refresh Rate
Best Overdrive Setting
Fast
Rise / Fall Time
3.5 ms
Total Response Time
8.3 ms
Overshoot Error
5.4 %
Dark Rise / Fall Time
3.5 ms
Dark Total Response Time
8.7 ms
Dark Overshoot Error
7.8 %

Overdrive Setting Response Time Chart Response Time Tables Motion Blur Photo
Off Chart Table Photo
Normal Chart Table Photo
Fast Chart Table Photo
Faster Chart Table Photo

The 27GL850 has an outstanding response time at its max refresh rate of 144Hz. The recommended Overdrive setting is 'Fast' as it has the least amount of motion blur, but there's still some overshoot in darker transitions. If that bothers you, the 'Normal' setting performs very similarly, but the response time is slower in all transitions, resulting in a bit more blur.

9.2
Motion
Response Time @ 60Hz
Best Overdrive Setting
Normal
Rise / Fall Time
4.4 ms
Total Response Time
9.6 ms
Overshoot Error
1.3 %
Dark Rise / Fall Time
4.4 ms
Dark Total Response Time
11.9 ms
Dark Overshoot Error
3.0 %

Overdrive Setting Response Time Chart Response Time Tables Motion Blur Photo
Off Chart Table Photo
Normal Chart Table Photo
Fast Chart Table Photo
Faster Chart Table Photo

Incredible response time at 60Hz, better than most 144Hz monitors, which is great news for console gamers. Unlike the Overdrive setting at its max refresh rate, the recommended setting is 'Normal'. It has significantly less overshoot than the 'Fast' and 'Faster' settings and motion looks the clearest.

10
Motion
Image Flicker
Flicker-Free Yes
PWM Dimming Frequency
0 Hz

The backlight is flicker-free, which helps reduce eye strain.

Note: We encountered a bug while testing the HDR real scene peak brightness that caused the screen to start flickering at 60Hz. We don't know why this happened, and we didn't notice it at any other time.

0
Motion
Black Frame Insertion (BFI)
Black Frame Insertion (BFI)
No BFI
BFI Maximum Frequency
N/A
BFI Minimum Frequency
N/A

There's no optional black frame insertion feature on the 27GL850.

9.0
Motion
Refresh Rate
Native
144 Hz
Max Refresh Rate
144 Hz
Variable Refresh Rate
Yes
FreeSync
Yes
G-SYNC
Compatible (NVIDIA Certified)
VRR Maximum
144 Hz
VRR Minimum
< 20 Hz
VRR Supported Connectors DisplayPort, HDMI

The 27GL850 has an excellent 144Hz refresh rate. It supports AMD's FreeSync variable refresh rate technology, but it's also certified by NVIDIA as G-SYNC compatible, so it works automatically with a recent NVIDIA graphics card.

Over HDMI, the 27GL850 only supports FreeSync up to 100Hz.

If you're looking for a similar monitor with a 165Hz refresh rate, then check out the ViewSonic Elite XG270QG.

Inputs
9.5
Inputs
Input Lag
Native Resolution
4.3 ms
Native Resolution @ 60Hz
14.0 ms
Variable Refresh Rate
4.7 ms
Variable Refresh Rate @ 60Hz
13.2 ms
10 Bit HDR
4.3 ms
Black Frame Insertion (BFI)
N/A

Outstanding low input lag, even with FreeSync enabled or in HDR. The 60Hz input lag is higher, though, which might disappoint console gamers.

8.3
Inputs
Resolution And Size
Native Resolution 2560 x 1440
Aspect Ratio 16:9
Megapixels 3.7 MP
Pixel Density
109 PPI
Screen Diagonal 27.0 inches
Screen Area 311 sq inches

The 1440p, 27 inch screen delivers a great amount of screen real estate, and is great for multitasking. This also provides an immersive gaming experience, allowing you to see more fine details.

Inputs
Inputs
Inputs
Total Inputs
DisplayPort 1 (DP 1.4)
Mini DisplayPort No
HDMI 2 (HDMI 2.0)
DVI No
VGA No
DisplayPort Out No
USB 2 (USB 3.0)
USB C No
Analog Audio Out 3.5mm 1
Microphone In 3.5mm No
Digital Optical Audio Out No
Analog Audio Out RCA No
Power Supply External Brick

The volume can be adjusted through the on-screen menu.

Features
Features
Additional Features
RGB Illumination
No
Speakers
No
HDR10 Yes
Multiple Input Display
No

There are very few additional features on this monitor. Like other UltraGear monitors, it can display a virtual crosshair on any game. There's also a 'Black Stabilizer' feature, which adjusts the gamma in dark scenes, making it easier to spot objects in the shadows.

If you want a monitor with more extra features, take a look at the Gigabyte Aorus FI27Q.

Features
On-Screen Display (OSD)
Features
Controls

Like most modern LG monitors, the 27GL850 has a joystick underneath the monitor to control the on-screen display.

Features
In The Box

  • Quick Setup Guide
  • USB-B cable
  • HDMI cable
  • DisplayPort cable
  • Power adapter and cable
  • Driver/Manual CD

Differences Between Sizes and Variants

We tested the 27 inch 27GL850-B, which is the only size available. There are other models in LG's UltraGear lineup, some of which are listed in the table below.

If someone comes across a different type of panel or if their 27GL850 doesn't correspond to our review, let us know and we will update the review. Note that some tests such as the gray uniformity may vary between individual units.

Model Size Resolution Refresh Rate Notes
32GK650F-B 32" 1440p 144Hz FreeSync
32GK650G-B 32" 1440p 144Hz G-SYNC
27GK750F-B 27" 1080p 240Hz FreeSync
27GL850-B 27" 1440p 144Hz FreeSync, NVIDIA certified
32GK850F-B 32" 1440p 144Hz FreeSync
32GK850G-B 32" 1440p 144Hz G-SYNC
34GK950F-B 34" 3440x1440 144Hz FreeSync
34GK950G-B 34" 3440x1440 120Hz G-SYNC

The 27GL850 we reviewed was manufactured in June 2019.

Compared to other monitors

Comparison picture

Left: Gigabyte Aorus AD27QD. Middle: LG 27GL850-B. Right: ASUS ROG Swift PG279QZ.

The LG 27GL850 is a great gaming monitor with outstanding motion handling. It has worse ergonomics than most comparable models, but if this doesn't matter for you it's a great choice. See also our reviews for the best gaming monitors, the best 1440p 144Hz monitors, and the best 27 inch monitors.

ASUS TUF VG27AQ
SEE PRICE
Amazon.com

The ASUS TUF VG27AQ is somewhat better than the LG 27GL850-B. The ASUS has a faster refresh rate that makes motion look smoother, and better ergonomics to help you place it comfortably on your desk. It supports a black frame insertion (BFI) feature that helps improve the overall appearance of motion and can also deliver more uniform blacks. The LG, on the other hand, has a faster response time, so fast-moving content has almost no blur, making the lack of BFI not an issue.

ASUS ROG Swift PG279Q
SEE PRICE
Amazon.com

The ASUS ROG Swift PG279Q and the LG 27GL850-B have very similar overall performance, but they have some significant differences. The LG supports HDR, supports FreeSync, and has better gradient thanks to its 10-bit panel. The ASUS, on the other hand, has better ergonomics, supports G-SYNC, and has an optional black frame insertion feature to help improve the appearance of motion.

BenQ EX2780Q
SEE PRICE
Amazon.com

The LG 27GL850-B is slightly better than the BenQ EX2780Q in mixed usage. Ergonomics are significantly better on the LG, as well as gradient performance. There's less color bleeding on the LG, but its black uniformity and contrast ratio are much worse than the BenQ.

ViewSonic Elite XG270QG
SEE PRICE
Amazon.com

The LG 27GL850-B and the ViewSonic Elite XG270QG are two similar-performing monitors. The ViewSonic has a max refresh rate of 165Hz, G-SYNC support, a black frame insertion feature to help reduce motion blur, and better ergonomics. The LG supports HDR and has much better out-of-box color accuracy. Even though the LG has a max refresh rate of 144Hz, the two monitors still have a very similar response time, except the LG is quicker at 60Hz.

Pixio PX7 Prime
SEE PRICE
Amazon.com

The LG 27GL850-B is slightly better than the Pixio PX7 Prime. The LG has slightly better viewing angles, and a faster response time, resulting in slightly clearer motion, although most people won't notice this.

Dell S2719DGF
SEE PRICE
BestBuy.com

The LG 27GL850-B is much better than the Dell S2719DGF for most uses, especially if ergonomics aren't important for you. The LG has much better picture quality, with wide viewing angles, much better gradient handling, and HDR support. The LG also has slightly better motion handling, with a slightly faster response time, resulting in slightly clearer motion.

Acer Predator XB271HU
SEE PRICE
Amazon.com

The LG 27GL850-B is better than the Acer Predator XB271HU. The LG supports HDR and can handle reflections better, which is important when there are a few lights in your room. The Acer, on the other hand, has a black frame insertion feature that helps make the image look crisper.

LG 27GL83A-B
SEE PRICE
Amazon.com

The LG 27GL850-B and the LG 27GL83A-B have very similar overall performance and any differences can be attributed to panel variance. The 27GL850-B has better inputs as it incorporates two USB 3.0 ports, while the 27GL83A-B has no USB ports.

Gigabyte Aorus FI27Q
SEE PRICE
Amazon.com

The Gigabyte Aorus FI27Q is marginally better than the LG 27GL850-B. The FI27Q has a much better build quality and ergonomics, as well as a better contrast ratio and color accuracy, but the LG has significantly better black uniformity. They perform similarly in terms of motion handling, but the LG has a faster response time, whereas the Aorus FI27Q has a higher refresh rate.

Samsung CHG70
SEE PRICE
BestBuy.com

The two monitors use different panel technologies, each with advantages and disadvantages. The LG 27GL850-B hs an IPS panel that allows wider viewing angles, whereas the Samsung CHG70 has a VA panel and offers better dark room performance thanks to the much better contrast ratio and local dimming feature. The LG has slightly faster response time, but the Samsung has a black frame insertion feature that can help make motion look crisper.

Gigabyte Aorus AD27QD
SEE PRICE
Amazon.com

The Gigabyte Aorus AD27QD and the LG 27GL850 are very similar overall. For gaming, the LG has slightly better motion handling, and is the better choice if you are sensitive to motion blur or overshoot artifacts. The AD27QD is more feature-packed, including better ergonomics, an optional black frame insertion feature, and countless additional gaming features.

Dell S2716DGR/S2716DG
SEE PRICE
BestBuy.com

The LG 27GL850-B is significantly better than the Dell S2716DGR/S2716DG. The LG has an IPS panel that offers much better viewing angles, has better gray uniformity, as well as color accuracy. The LG also has better reflection handling and gradient performance, but the Dell has a black frame insertion feature that helps reduce motion blur and its ergonomics are much better.

LG 27UK650-W
SEE PRICE
Amazon.com

The LG 27GL850-B is marginally better than the LG 27UK650-W. The 27UK650 has a full 4k resolution which favors multitasking. On the other hand, the 27GL850 is steered more towards gaming as it has a higher refresh rate, a much lower input lag and faster response time which leaves only a small blur trail behind fast-moving objects.

LG 27GL650F-B
SEE PRICE
Amazon.com

The LG 27GL850-B is slightly better than the 27GL650F-B. The 27GL850-B has a faster response time, resulting in clearer motion with less blur. The 27GL850 also has a better native resolution, so you can see more fine details in your favorite games, and it has an optional USB hub.

Acer VG271UP
SEE PRICE
Amazon.com

The LG 27GL850-B is better than the Acer VG271UP. The LG 27GL850-B has better ergonomics, so you can position it to your liking with ease, and has a faster response time that helps deliver slightly crisper motion. The Acer VG271UP has an optional Black Frame Insertion feature to make motion crisper, and although it has marginally better contrast, its terrible black uniformity is noticeable in a dark room.

MSI Optix MAG271CQR
SEE PRICE
Amazon.com

The LG 27GL850-B and the MSI Optix MAG271CQR use different panel technologies, each with their own strengths and weaknesses. The MSI looks better in a dark room, as it has better contrast, but the LG has better viewing angles, and it supports HDR. The Optix has an optional black frame insertion feature, and it has better reflection handling.

ViewSonic VX2758-2KP-MHD
SEE PRICE
Amazon.com

The LG 27GL850-B is better than the ViewSonic VX2758-2KP-MHD. The LG has much better ergonomics, motion handling, and color accuracy, but the ViewSonic has a much better contrast ratio and black uniformity. The LG supports HDR and has a much better gradient performance, but doesn't have a black frame insertion feature like the ViewSonic.

AOC CQ27G1
SEE PRICE
Amazon.com

For most uses, the LG 27GL850-B performs much better than the AOC CG27G1. The LG has an IPS panel that provides wider viewing angles and it can't get a lot brighter, making it more suitable for bright environments. Also, the LG supports HDR and has a much faster response time, at both maximum refresh rate and at 60Hz. On the other hand, the AOC has a VA panel that has significantly better dark room performance and it has an impressive out-of-the-box color accuracy.

ASUS TUF VG27VQ
SEE PRICE
Amazon.com

The LG 27GL850-B is a much better monitor than the ASUS TUF VG27VQ. The 1440p resolution provides clearer images, plus the viewing angles, response time, and gradient handling are much better on the LG, and it supports HDR. Instead, the ASUS has a much better contrast ratio and higher refresh rate, which might please some gamers who don't mind losing some picture quality.