The Vizio M8 Series Quantum 2020 is a good mid-range 4k TV. Like its predecessor, the Vizio M Series Quantum 2019, it sports a VA panel that can produce deep blacks for a great dark room viewing experience. Gamers should be happy with its decent response time, low input lag, and variable refresh rate support, although the latter isn't fully functional at this time. It has decent reflection handling and gets bright enough to overcome glare, but not quite bright enough to make highlights stand out in HDR content. While it does have a full-array local dimming feature, its implementation is sub-par, resulting in a lot of blooming around bright objects.
Note that at the time of writing, this TV is difficult to find through most major retailers. We'll provide links once they're available. Our unit was purchased from Walmart.
The Vizio M Series Quantum 2020 is an overall good TV. Like most VA panel TVs, it delivers inky blacks, making it a good choice to watch movies or play video games in the dark. It has a decent response time and low input lag, and it can display proper chroma 4:4:4 when using it as a PC monitor. It overcomes glare easily in a well-lit environment but doesn't get bright enough to deliver a satisfying HDR experience. Also, its poor viewing angles make it less suitable for large rooms or wide seating areas.
The Vizio M Series Quantum is good for watching movies. Its high contrast ratio allows it to produce deep and inky blacks, which is great for watching movies in the dark. It upscales 1080p content well and can remove judder from low frame rate content. It has a full-array local dimming feature; however, it doesn't perform well, as it causes a lot of blooming around bright objects.
The Vizio M Series Quantum is decent for watching TV shows. It provides good visibility in well-lit environments, as it gets bright enough to fight glare and has decent reflection handling. Its VA panel has poor viewing angles, so it isn't ideal if you like walking around while watching TV. Vizio's SmartCast platform is easy to use, but its app selection is limited because there's no app store.
The Vizio M Series Quantum is decent for watching sports. There's minimal motion blur in fast-moving scenes thanks to its decent response time, and it has a Black Frame Insertion as well to help improve clarity. It gets bright enough to overcome glare in a well-lit environment and handles reflections decently well. Its poor viewing angles might be an issue, especially if you like watching with a big group of people. There's a fair amount of dirty screen effect on our unit; however, this can vary between individual units.
The Vizio M Series Quantum is great for gaming. It has a decent response time to deliver crisp images with minimal motion blur, and low input lag to make every action feel nearly instantaneous. Its high contrast ratio results in deep blacks, making it an excellent choice for dark room gaming. Unfortunately, while it does support variable refresh rate, it isn't fully functional at the time of writing.
The Vizio M Series Quantum is good for watching movies in HDR. It has a high contrast ratio to produce deep blacks and an excellent HDR color gamut to produce a wide range of colors. Sadly, it doesn't get bright enough to make highlights stand out, and the local dimming doesn't perform all that well.
The Vizio M Series Quantum is great for gaming in HDR. It provides a responsive gaming experience with its low input lag, and it has a decent response time that results in only a short blur trail behind fast-moving objects. It has a high contrast ratio and excellent color gamut, but it doesn't get bright enough to make highlights pop in HDR content.
The Vizio M Series Quantum is a good TV for use as a PC monitor. It has low input lag, a decent response time, and can display chroma 4:4:4. It handles reflections decently well and gets bright enough to fight glare. Unfortunately, its VA panel has poor viewing angles, so the edges of the screen might look washed out if you sit too close.
The Vizio M Series Quantum 2020 has an excellent design. It's nearly, if not entirely, identical to the Vizio M Series Quantum 2019. It's simple and minimalist, with thin borders and wide-set feet.
The feet are set almost as wide as the TV itself, so it requires a large table to put it on. They support the TV well, and there's very little wobble.
Footprint of the 65" stand: 50.4" x 11.7"
The top portion of the back is metal, while the bottom portion is made out of plastic. Although some of the inputs are bottom-facing, they're easy to access even when the TV is wall-mounted. Unfortunately, there's no cable management.
The Vizio M Series Quantum's borders are thin and aren't distracting.
The bottom portion of the TV is thicker than the top, but it's still relatively thin and doesn't stick out much when wall-mounted.
The Vizio M Series Quantum's build quality is decent. It's a mix of metal and plastic, and it feels very sturdy. There's only a little bit of flex around the inputs. The stand supports the TV well, and it doesn't wobble much.
The Vizio M Series Quantum has an excellent contrast ratio, and it gets a lot better with local dimming enabled. Blacks look deep and inky, which is great for watching in a dark environment.
Note that the contrast ratio can vary between units.
The Vizio M Series Quantum has a sub-par local dimming feature. There are a few issues with its implementation, as well as some bugs that need fixing through a firmware update. The recommended setting is 'High' (local dimming is called Active Full-Array in the settings menu) and is the setting we used for testing.
The most glaring issue with the local dimming is the amount of blooming. There's a lot of it, and like the Vizio P Series Quantum 2020, it's inconsistent between different areas of the screen, which makes the screen look blotchy and accentuates uniformity issues. In dark scenes with small highlights, like a starfield, it has a hard time deciding which stars should stand out, so while some stars look bright with blooming around, others look dim. Subtitles aren't handled well, and there's a lot of blooming around them.
It doesn't crush blacks, although it's mostly due to the higher overall black level and the amount of blooming present. Zone transitions are very slow, and the lighting zones are visible when bright objects move across the screen.
We encountered a few bugs with the local dimming. The first is that the TV indicates that the local dimming is on even when it's off. Turning the local dimming off and back on again usually resolves this issue. The second bug is that the local dimming shuts off when viewing Dolby Vision content. Unfortunately, there's no workaround for this and requires a firmware update. We'll retest it once it's available. The third bug is that when the TV is in 'Dolby Vision Bright' Picture Mode and local dimming is set to 'Medium', the screen flickers when it displays a bright, static image, even though the local dimming is disabled due to the mentioned bug.
Good SDR peak brightness. The brightness varies a lot depending on the scene, but overall, it's enough to overcome glare in a well-lit room.
We measured the SDR peak brightness after calibration, using the 'Calibrated Dark' Picture Mode, with Active Full-Array set to 'High', Color Temperature set to 'Warm', and Gamma set to '2.2'.
If you don't mind a slightly less accurate image, you can achieve a higher peak brightness by setting the Picture Mode to 'Vivid, Active Full-Array to 'High', and Color Temperature to 'Cool'. We achieved a peak brightness of 648 cd/m² in the 10% window using these settings.
Mediocre HDR peak brightness. It's an improvement over the Vizio M Series Quantum 2019, but it still isn't enough to make highlights pop in HDR content. Just like in SDR, the brightness varies a lot across different content.
We measured the HDR peak brightness before calibration, using the 'Calibrated Dark' Picture Mode, with Active Full-Array set to 'High', Color Temperature set to 'Warm', and Gamma set to '2.2'.
If you want an even brighter picture and don't mind losing image accuracy, set the Picture Mode to 'Vivid', Active Full-Array to 'High', Color Temperature to 'Cool', and Gamma to '1.8'. We achieved a peak brightness of 629 cd/m² in the 10% window using the settings.
Gray uniformity on our unit of the Vizio M Series Quantum is mediocre. There's noticeable dirty screen effect in the center, and there are a few spots that appear darker than the rest of the screen, like the top corners. It's much better in dark scenes, but the dirty screen effect is still visible.
Note that gray uniformity can vary between units.
Like most VA panel TVs, the Vizio M Series Quantum's viewing angles are poor. This results in images looking washed out when viewed from the side and isn't ideal for wide seating areas.
Black uniformity on our unit is decent. With local dimming disabled, the whole screen looks more grayish but otherwise very uniform. With local dimming enabled, black level is much better, but the blooming around the test cross is more visible.
Note that black uniformity can vary between units.
The Vizio M65Q8-H1 has decent reflection handling. It handles ambient light well but struggles more with direct reflections, so it's best to avoid placing the TV opposite bright lights.
Before calibration, the Vizio M65Q8-H1 has decent color accuracy. Most colors are only slightly inaccurate and are hard to spot. White balance is off, and the color temperature is much warmer than our 6500K target, resulting in a slight reddish tint. Gamma follows the target reasonably well, although most scenes are too dark and bright scenes are too bright.
Note that color accuracy can vary between units.
After calibration, color accuracy is exceptional. White balance and gamma are nearly perfect, and the color temperature is much closer to our 6500K target. The remaining color inaccuracies shouldn't be noticeable without the aid of a colorimeter.
You can see our recommended settings here.
480p content, such as from DVDs, looks decent, but it isn't as good as most TVs.
There aren't any obvious artifacts when upscaling 720p content, but it doesn't look as good as most 4k TVs.
Upscaling of 1080p content, such as from Blu-rays, looks almost as good as 4k.
The Vizio M Series Quantum uses a BGR sub-pixel structure. It doesn't affect picture quality but can affect text clarity when using the TV as a PC monitor. You can read more about it here.
Excellent HDR color gamut. The Vizio M65Q8-H1 has near full coverage of the commonly-used DCI P3 color space and great coverage of the wider Rec. 2020. The EOTF follows the PQ curve reasonably well until the roll-off, but most scenes are too dark. The 'Game' Mode EOTF follows the target curve much closer; however, dark scenes are still too dark, and the roll-off is more abrupt.
If you find HDR content too dim, you can make it brighter by setting the Picture Mode to 'Calibrated Dark', Active Full-Array to 'High', Color Temperature to 'Normal', and Local Contrast to 'High'. These settings result in a brighter image, as you can see in this EOTF.
Great color volume. It displays dark and saturated colors well thanks to its high contrast ratio. It struggles with bright blues, which is typical for LCDs.
The Vizio M65Q8-H1 has great gradient handling. There's only some fine banding in the darker shades. There's no setting to help smooth it out, and enabling Noise Reduction doesn't seem to help at all.
There are no signs of temporary image retention; however, this can vary between individual units.
We don't expect VA panels to experience permanent image retention, as the VA panel in our long-term test appears immune.
The Vizio M Series Quantum has decent response time, resulting in only a short blur trail behind fast-moving objects. However, there are some motion artifacts caused by the slower dark scene transitions and overshoot.
The Vizio M Series Quantum is flicker-free when the TV's brightness is set to max. However, the backlight flickers at 480Hz in all picture modes if the backlight is set below max.
The Vizio M65Q8-H1 has an optional Black Frame Insertion feature to help improve motion clarity. When enabled, the backlight's flickering frequency drops to 60Hz. Unfortunately, it causes a bit of image duplication with 60fps content. To turn on BFI, enable Clear Action.
The Vizio M65Q8-H1 doesn't have a motion interpolation feature.
Due to the TV's slower response time, there's no stutter in 60fps content. However, It can stutter a bit in 24p content.
The Vizio M Series 2020 can remove judder from 24p sources and native apps, but not from 60i/60p sources. To remove judder, enable Film Mode.
The Vizio M Series 2020 is advertised to support HDMI Forum VRR to help reduce screen tearing when gaming. At the time of writing, it isn't fully functional. It works for a few minutes and there's no tearing during that time, but the screen blacks out regularly, making it unusable. We observed the same issue on the Vizio P Series Quantum 2020, even though they have different firmware. We'll retest it once an update is available. To turn on VRR, enable Variable Refresh Rate.