Products
LG C4 OLED
TCL QM851G
Tested using Methodology v2.0.1
Updated Sep 02, 2025 06:40 PM
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BestBuy.com
Tested using Methodology v2.0.1
Updated Aug 12, 2025 01:39 PM
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Resolution4k
Native Refresh Rate
144Hz
TypeOLED
Sub-Type
WOLED
Dolby Vision
Yes
Screen Finish
Glossy
Resolution4k
Native Refresh Rate
144Hz
TypeLED
Sub-Type
VA
Dolby Vision
Yes
Screen Finish
Glossy
Our Verdict
LG C4 OLED
TCL QM851G
The LG C4 OLED is better than the TCL QM851G. The LG has perfect contrast, so it displays inky blacks with no blooming at all. When it comes to accuracy, the LG displays an image that is much closer to the content creator's intent in SDR and HDR. The LG also has a much wider viewing angle, so it's the better option for watching TV with a group, and it has better image processing. Additionally, the LG has a faster response time for less blur behind quick motion. However, the TCL is the much brighter TV, so if you need a TV for use in a very bright room, it's the better option.
Variants
- OLED42C4PUA (42")
- OLED48C4PUA (48")
- OLED55C4PUA (55")
- OLED65C4PUA (65")
- OLED77C4PUA (77")
- OLED83C4PUA (83")
- 65QM851G (65")
- 75QM851G (75")
- 85QM851G (85")
- 98QM851G (98")
Check Price
42"
OLED42C4PUA
SEE PRICE
LG.com
42"
48"
OLED48C4PUA
SEE PRICE
Amazon.com
48"
55"
OLED55C4PUA
SEE PRICE
BestBuy.com
55"
65"
OLED65C4PUA
SEE PRICE
BestBuy.com
65"
65QM851G
SEE PRICE
Amazon.com
75"
75"
75QM851G
SEE PRICE
Amazon.com
77"
OLED77C4PUA
SEE PRICE
BestBuy.com
77"
83"
OLED83C4PUA
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Amazon.com
83"
85"
85"
85QM851G
SEE PRICE
BestBuy.com
98"
98"
98QM851G
SEARCH
Amazon.com
Main Differences for
Mixed Usage
Mixed Usage
Threshold
Mixed Usage
8.3
8.2
HDR Brightness
7.7
9.4
SDR Brightness
6.5
9.5
Contrast
10
8.9
Full Comparison
Brightness
HDR Brightness
7.7
9.4
HDR Hallway Photo
HDR Cityscape Photo
HDR Landscape Photo
Hallway Lights (~1950 cd/m²)
804 cd/m²
1,472 cd/m²
Yellow Skyscraper (~700 cd/m²)
590 cd/m²
611 cd/m²
Landscape Pool (~300 cd/m²)
265 cd/m²
473 cd/m²
Peak 2% Window
950 cd/m²
2,564 cd/m²
Peak 10% Window
932 cd/m²
3,467 cd/m²
Peak 25% Window
614 cd/m²
3,338 cd/m²
Peak 50% Window
331 cd/m²
1,814 cd/m²
Peak 100% Window
194 cd/m²
967 cd/m²
Sustained 2% Window
917 cd/m²
2,497 cd/m²
Sustained 10% Window
905 cd/m²
3,319 cd/m²
Sustained 25% Window
582 cd/m²
3,253 cd/m²
Sustained 50% Window
328 cd/m²
1,810 cd/m²
Sustained 100% Window
192 cd/m²
965 cd/m²
Automatic Brightness Limiting (ABL)
0.096
0.060
HDR Brightness In Game Mode
6.7
9.4
HDR Hallway Photo
HDR Cityscape Photo
HDR Landscape Photo
Hallway Lights (~1950 cd/m²)
798 cd/m²
1,393 cd/m²
Yellow Skyscraper (~700 cd/m²)
415 cd/m²
625 cd/m²
Landscape Pool (~300 cd/m²)
165 cd/m²
447 cd/m²
Peak 2% Window
920 cd/m²
4,167 cd/m²
Peak 10% Window
923 cd/m²
3,425 cd/m²
Peak 25% Window
491 cd/m²
3,366 cd/m²
Peak 50% Window
296 cd/m²
1,796 cd/m²
Peak 100% Window
196 cd/m²
956 cd/m²
Sustained 2% Window
891 cd/m²
2,384 cd/m²
Sustained 10% Window
894 cd/m²
3,300 cd/m²
Sustained 25% Window
472 cd/m²
3,251 cd/m²
Sustained 50% Window
294 cd/m²
1,792 cd/m²
Sustained 100% Window
195 cd/m²
953 cd/m²
Automatic Brightness Limiting (ABL)
0.097
0.060
SDR Brightness
6.5
9.5
Real Scene Peak Brightness
411 cd/m²
1,108 cd/m²
Peak 2% Window
427 cd/m²
4,043 cd/m²
Peak 10% Window
425 cd/m²
3,355 cd/m²
Peak 25% Window
405 cd/m²
3,291 cd/m²
Peak 50% Window
382 cd/m²
1,767 cd/m²
Peak 100% Window
259 cd/m²
940 cd/m²
Sustained 2% Window
420 cd/m²
2,320 cd/m²
Sustained 10% Window
420 cd/m²
3,238 cd/m²
Sustained 25% Window
401 cd/m²
3,171 cd/m²
Sustained 50% Window
379 cd/m²
1,761 cd/m²
Sustained 100% Window
258 cd/m²
938 cd/m²
Automatic Brightness Limiting (ABL)
0.030
0.060
Black Level
Contrast
10
8.9
Contrast Picture
Contrast
Inf : 1
201,150 : 1
Native Contrast
Inf : 1
6,515 : 1
Lighting Zone Precision
10
8.5
Lighting Zone Precision Picture
Lighting Zone Transitions
10
8.5
Preferred LD Video, Moving Object
Local Dimming
No
Yes
Backlight
No Backlight
Full-Array
Dimming Zone Count Of The Tested TV
8,294,400
2,880
Contrast And Dark Details In Game Mode
9.5
9.0
Lighting Zone Precision Photo In Game Mode
Preferred LD Video, Moving Object In Game Mode
Game Transitions With VRR And Preferred LD
Black Uniformity
10
8.9
Black Uniformity Picture With Preferred Local Dimming
Std. Dev.
N/A
0.154%
Native Black Uniformity Picture
Native Std. Dev.
0.144%
0.569%
Color
SDR Color Volume
7.9
7.7
DCI-P3 Gamut Rings
CIELAB DCI-P3 Coverage
93.69%
90.94%
BT.2020 Gamut Rings
CIELAB BT.2020 Coverage
62.82%
67.01%
HDR Color Volume
7.6
9.0
P3 Color Volume ITP Picture
1,000 cd/m² DCI P3 Coverage ITP
79.2%
85.2%
2020 Color Volume ITP Picture
10,000 cd/m² BT.2020 Coverage ITP
36.2%
54.8%
White Luminance
1,008 cd/m²
2,513 cd/m²
Red Luminance
104 cd/m²
585 cd/m²
Green Luminance
333 cd/m²
1,885 cd/m²
Blue Luminance
38 cd/m²
189 cd/m²
Cyan Luminance
365 cd/m²
2,075 cd/m²
Magenta Luminance
134 cd/m²
773 cd/m²
Yellow Luminance
425 cd/m²
2,451 cd/m²
SDR Pre-Calibration Color Accuracy
8.7
7.5
Pre White Balance Picture
Pre Gamma Curve Picture
Pre Color Picture
White Balance dE 2000
1.61
3.36
Color dE 2000
0.97
2.07
Gamma
2.19
2.09
Color Temperature
6,262 K
6,127 K
Picture Mode
Expert (Dark Space)
Movie
Color Temp Setting
Warm 50
Warm -5
Gamma Setting
2.2
2.2
SDR Post-Calibration Color Accuracy
9.7
9.6
Post White Balance Picture
Post Gamma Curve Picture
Post Color Picture
White Balance dE 2000
0.26
0.24
Color dE 2000
0.62
0.82
Gamma
2.20
2.20
Color Temperature
6,460 K
6,483 K
White Balance Calibration
22 point
20 point
Color Calibration
Yes
Yes
HDR Pre-Calibration Color Accuracy
8.9
5.7
HDR Pre White Balance Picture
HDR Pre Color Picture
White Balance dE ITP
3.95
41.45
Color dE ITP
5.3
49.6
Color Temperature
6,303 K
6,308 K
Picture Mode
Cinema
Movie
HDR Post-Calibration Color Accuracy
9.4
7.0
HDR Post White Balance Picture
HDR Post Color Picture
White Balance dE ITP
2.50
19.70
Color dE ITP
5.00
8.60
Color Temperature
6,474 K
6,276 K
Processing
PQ EOTF Tracking
8.8
3.9
PQ EOTF Graph
600 Nit Tracking Delta
0.0033
0.0313
1000 Nit Tracking Delta
0.0033
0.0314
4000 Nit Tracking Delta
0.0039
0.0314
Low-Quality Content Smoothing
8.6
8.1
Low-Quality Content Smoothing Picture
Smoothing
9.0
8.5
Detail Preservation
7.5
7.0
Upscaling: Sharpness Processing
8.0
7.5
Sharpness Picture - 480p
HDR Native Gradient
7.8
7.8
HDR Gradient Picture
100% Black To 50% Gray
6.0
6.0
50% Gray To 100% White
6.0
6.0
100% Black To 50% Red
8.0
8.0
50% Red To 100% Red
10
10
100% Black To 50% Green
8.0
8.0
50% Green To 100% Green
6.0
8.0
100% Black To 50% Blue
10
8.0
50% Blue To 100% Blue
8.0
8.0
Game Mode Responsiveness
Input Lag
9.0
8.4
1080p @ 60Hz
10.0 ms
14.1 ms
1080p @ 60Hz Outside Game Mode
89.6 ms
125.0 ms
1080p @ 120Hz
5.3 ms
6.1 ms
1080p @ Max Refresh Rate
4.6 ms
8.0 ms
4k @ 60Hz
9.9 ms
14.1 ms
4k @ 60Hz @ 4:4:4
9.9 ms
15.0 ms
4k @ 60Hz Outside Game Mode
89.5 ms
124.7 ms
4k @ 60Hz With Interpolation
85.5 ms
116.5 ms
4k @ 120Hz
5.3 ms
5.9 ms
4k @ Max Refresh Rate
4.6 ms
5.0 ms
8k @ 60Hz
N/A
N/A
Supported Resolutions
9.4
9.5
Resolution
4k
4k
480p @ 59.94Hz (Widescreen)
Yes
Yes
720p @ 59.94Hz
Yes
Yes
1080p @ 60Hz @ 4:4:4
Yes
Yes
1080p @ 120Hz
Yes
Yes
1080p Maximum Refresh Rate
144 Hz
240 Hz
4k @ 60Hz
Yes
Yes
4k @ 60Hz @ 4:4:4
Yes
Yes
4k @ 120Hz
Yes
Yes
4k @ 120Hz @ 4:4:4
Yes
Yes
4k Maximum Refresh Rate
144 Hz
144 Hz
8k @ 30Hz Or 24Hz
No
No
8k @ 60Hz
No
No
Variable Refresh Rate
8.5
8.8
Native Refresh Rate
144Hz
144Hz
Variable Refresh Rate
Yes
Yes
HDMI Forum VRR
Yes
Yes
FreeSync
Yes
Yes
G-SYNC Compatible
Yes (NVIDIA Certified)
Yes
4k VRR Maximum
144 Hz
144 Hz
4k VRR Minimum
< 20 Hz
< 20 Hz
1080p VRR Maximum
144 Hz
240 Hz
1080p VRR Minimum
< 20 Hz
< 20 Hz
VRR + Local Dimming
No Local Dimming
Yes
CAD In Game Mode @ Max Refresh Rate
9.6
7.5
Pursuit Photo Max Refresh
CAD Heatmap Max Refresh
Transition At Max Refresh
0 to 31
0 to 31
Avg. CAD
39
173
Best 10% CAD
7
71
Worst 10% CAD
106
303
CAD In Game Mode @ 120Hz
9.7
6.9
Pursuit Photo 120Hz
CAD Heatmap 120Hz
Transition At 120Hz
0 to 31
0 to 31
Avg. CAD
35
200
Best 10% CAD
6
69
Worst 10% CAD
94
482
CAD In Game Mode @ 60Hz
9.6
7.0
Pursuit Photo 60Hz
CAD Heatmap 60Hz
Transition 60Hz
0 to 31
0 to 31
Avg. CAD
45
217
Best 10% CAD
6
71
Worst 10% CAD
132
372
PS5 Compatibility
PS5 Screenshot
Auto Low Latency Mode (ALLM)
Yes
Yes
4k @ 120Hz
Yes
Yes
1440p @ 120Hz
Yes
Yes
1080p @ 120Hz
Yes
Yes
HDR
Yes
Yes
VRR
Yes
Yes
Xbox Series X|S Compatibility
Xbox Series X Screenshot
Auto Low Latency Mode (ALLM)
Yes
Yes
4k @ 120Hz
Yes
Yes
1440p @ 120Hz
Yes
Yes
1080p @ 120Hz
Yes
Yes
HDR
Yes
Yes
VRR
Yes
Yes
Motion Handling
Stutter
4.2
6.1
Frame Hold Time @ 24 fps
41.3 ms
36.2 ms
Frame Hold Time @ 60 fps
16.3 ms
11.2 ms
24p Judder
10
10
Judder-Free 24p
Yes
Yes
Judder-Free 24p via 60p
Yes
Yes
Judder-Free 24p via 60i
Yes
Yes
Judder-Free 24p via Native Apps
Yes
Yes
Response Time
9.6
8.1
Pursuit Photo 60Hz
Response Time Heatmap 60Hz
Transition At 60Hz
0 to 31
0 to 31
First Response Time
0.4 ms
5.5 ms
Total Response Time
3.9 ms
10.6 ms
Worst 10% Response Time
10.3 ms
22.9 ms
Flicker
Backlight chart
Flicker-Free
No
No
PWM Dimming Frequency
0 Hz
30,000 Hz
Black Frame Insertion (BFI)
BFI Picture
BFI Frequency Picture
Optional BFI
Yes
Yes
Min Flicker For 60 fps
60 Hz
60 Hz
60Hz For 60 fps
Yes
Yes
120Hz For 120 fps
No
Yes
Min Flicker For 60 fps In Game Mode
60 Hz
60 Hz
Motion Interpolation
Motion Interpolation (30 fps) Picture
Motion Interpolation (30 fps)
Yes
Yes
Motion Interpolation (60 fps) Picture
Motion Interpolation (60 fps)
Yes
Yes
Reflections
Direct Reflections
6.5
6.3
Ring Light Picture
Direct Reflections Graph
Peak Direct Reflection Intensity
42.4%
46.5%
Screen Finish
Glossy
Glossy
Ambient Black Level Raise
9.3
9.1
Black Level Raise Picture
Bright Room Black Level Raise Graph
Black Luminance @ 0 lx
0.00 cd/m²
0.00 cd/m²
Black Luminance @ 1000 lx
0.24 cd/m²
0.38 cd/m²
Total Reflected Light
8.8
7.8
Bright Room Off Picture
Ring Picture Total Reflection
Total Reflected Light Intensity
7,717% ⋅ pixel
12,962% ⋅ pixel
Diffraction Artifacts
No
Yes
Ambient Color Saturation
7.2
8.4
Bright Room Color Volume Graph
Low-Luminance Colors @ 1000 lx
65.68%
71.72%
Mid-Luminance Colors @ 1000 lx
56.69%
68.86%
High-Luminance Colors @ 1000 lx
37.68%
59.50%
Panel
Viewing Angle
8.9
6.2
Viewing Angle Video
Chroma Graph
Color Washout
48°
23°
Hue Graph
Color Shift
27°
31°
Lightness Graph
Brightness Loss
70°
30°
Black Level Raise
70°
18°
Gamma Shift
70°
18°
Gray Uniformity
8.1
7.1
50% Uniformity Picture
50% Std. Dev.
1.063%
2.225%
50% DSE
0.120%
0.170%
5% Uniformity Picture
5% Std. Dev.
0.323%
0.670%
5% DSE
0.102%
0.093%
Panel Technology
Spectral Power Distribution
Pixels Picture
Type
OLED
LED
Sub-Type
WOLED
VA
Subpixel Layout
RWBG
BGR
Inputs
Input Specifications
Side Inputs Picture
Rear Inputs Picture
HDMI
4 (4x HDMI 2.1)
4 (2x HDMI 2.0, 2x HDMI 2.1)
HDMI 2.1 Rated Speed
48 Gbps
48 Gbps
ATSC Tuner
1.0
3.0 (NEXTGEN TV)
USB Ports
3
3
USB 3.0
No
Yes (1)
Audio Out 3.5mm
0
1
Wi-Fi
Yes (2.4 GHz, 5 GHz)
Yes (2.4 GHz, 5 GHz)
Ethernet Speed
100 Mbps
100 Mbps
Composite In
0
1 (Adapter Required, Not Incl.)
Digital Optical Audio Out
1
1
Audio Passthrough
ARC/eARC Port
eARC
eARC
eARC: Dolby Atmos Over Dolby Digital Plus
Yes
Yes
eARC: Dolby Digital Plus 7.1
Yes
Yes
eARC: LPCM 7.1 Over Dolby MAT
Yes
Yes
eARC: Dolby TrueHD 7.1
Yes
Yes
eARC: DTS:X Over DTS-HD MA
Yes
Yes
eARC: DTS-HD Master Audio 7.1
Yes
Yes
eARC: LPCM Channels (Bitstream)
7.1
7.1
ARC: Dolby Digital 5.1
Yes
Yes
ARC: DTS 5.1
Yes
Yes
Optical: Dolby Digital 5.1
Yes
Yes
Optical: DTS 5.1
Yes
Yes
HDR Format Support
HDR10
Yes
Yes
HDR10+
No
Yes
Dolby Vision
Yes
Yes
HLG
Yes
Yes
Design
Style
Design Picture
Curved
No
No
Stand
Stand Picture
Back
Back Picture
Wall Mount
VESA 300x200
VESA 400x400
Borders
Borders Picture
Borders
0.24" (0.6 cm)
0.31" (0.8 cm)
Thickness
Thickness Picture
Max Thickness
1.77" (4.5 cm)
2.28" (5.8 cm)
Build Quality
9.0
8.5
Build quality picture
Smart Features
Interface
Smart TV Picture
Smart OS
webOS
Google TV
Version
24
12
Ad-Free
0.0
0.0
Ads Picture
Ads
Yes
Yes
Opt-out
No
No
Suggested Content in Home
No
Yes
Opt-out of Suggested Content
No
No
Remote
Remote Picture
Voice Control
Yes
Yes
TV Controls
Controls Picture
Mute Switch
Yes
Yes
In The Box
In The Box Picture
Misc
Power Consumption
78 W
66 W
Power Consumption (Max)
215 W
307 W
Firmware
03.10.31
V8-T653T02-LF1V085
Sound Quality
Frequency Response
6.7
7.0
Frequency Response
Low-Frequency Extension
80.00 Hz
75.51 Hz
Std. Dev. @ 70
1.18 dB
3.92 dB
Std. Dev. @ 80
1.68 dB
3.60 dB
Std. Dev. @ Max
5.56 dB
4.90 dB
Max
84.2 dB SPL
87.3 dB SPL
Dynamic Range Compression
5.13 dB
4.74 dB
Digital Room Correction
Yes
Yes
Check Price
42"
OLED42C4PUA
SEE PRICE
LG.com
42"
48"
OLED48C4PUA
SEE PRICE
Amazon.com
48"
55"
OLED55C4PUA
SEE PRICE
BestBuy.com
55"
65"
OLED65C4PUA
SEE PRICE
BestBuy.com
65"
65QM851G
SEE PRICE
Amazon.com
75"
75"
75QM851G
SEE PRICE
Amazon.com
77"
OLED77C4PUA
SEE PRICE
BestBuy.com
77"
83"
OLED83C4PUA
SEE PRICE
Amazon.com
83"
85"
85"
85QM851G
SEE PRICE
BestBuy.com
98"
98"
98QM851G
SEARCH
Amazon.com
LG C4 OLED
TCL QM851G
Comments
LG C4 OLED vs TCL QM851G: Main Discussion
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