The QN85QN85B is a 85 inch 4K TV from Samsung. It was launched in 2022. It features a True 10-bit VA panel with Anti-glare/Matte finish. The maximum resolution it can display is 3840 x 2160 with a refresh rate of 120 Hz and a pixel density of 52 ppi.
Picture Quality
After screen size and resolution, the next important spec of a display is its Color Reproduction Accuracy, which is defined by its color gamut specification.
Speaking of which, this TV is rated with a DCI P3 color space coverage of 100%. This is equivalent to 136.36% sRGB coverage. The color quality on this TV should be Lifelike!
What Color Gamut means ?
Color gamut spec of a display is the measurement of the range of colors that the TV can produce.
A display with poor color reproduction will produce washed out colors that will spoil your immersive experience.
Different manufacturers use different units to specify color gamut. Such as — sRGB (most popular), NTSC, DCI P3 Adobe RGB and rec.2020.
As for this TV it is specified in DCI P3.
But don't worry, here is a chart that you can use to choose a TV with good color accuracy.
Now, after color gamut, the static contrast specification of a TV has equally important role in picture quality.
Understanding Static Contrast
A TV with low static contrast ratio will not produce deep enough blacks and may bleed backlight as below:

The static contrast ratio of above TV is rated 800:1. So make sure you get a TV with a static contrast of >= 1000:1. Ofcourse, More is better.
Like resolution, the static contrast ratio is also equally responsible for details. To put it into perspective, a TV with low contrast ratio will produce less shades of colors, so lesser detail overall.
If given a choice, always prefer a FHD TV with high contrast ratio over a 4K TV with low contrast ratio.
This TV features a static contrast ratio of 8000:1., well enough to produce deep blacks. The panel comes with local dimming backlight technology which is a plus.
HDR10, HDR10+, HDR10+ Adaptive, HDR10+ Gaming, HLG (Hybrid Log Gamma) and Quantum HDR 24X are also supported on this TV, so that's a plus.
As for brightness, it is capable of producing a peak brightness of 250 nits. The backlight used on the panel is Mini LED.
Gaming Performance
If you are planning to use your TV just for content consumption, you can safely ignore these specifications. But if you are also going to use the TV for gaming or use it as a PC monitor, you should get a TV with the lowest input lag and response time.
The input lag on this TV is 6 ms and its minimum response time is N/A. Pick this one if you are a gamer.
Understanding Input lag and response time
This lag is the latency at which your key-presses or mouse movements changes the content of the TV. Though, this won't matter much if you aren't into competitive/FPS games like call of duty.
But ideally, look for a TV that features an input lag and response time of < 20ms.
Ergonomics and Dimensions
Coming to ergonomics — If you plan to wall mount the TV, you can make use of the VESA mount provided with this TV, which by the way has an interface size of 600 x 400 mm. However, there is no Swivel, Tilt or Pivot feature support in this TV.
The vertical and horizontal measurements of this TV are 74.5 inches and 45 inches respectively.
In terms of thickness, it is just 1 inches thick.
In total it weighs around 49.3 kgs (including stand). Without stand, it weighs 42.7 Kilograms.
Hardware and Audio
The internals of this TV is powered by 4-Core CPU. There is no mention on the RAM on the TV's official specsheet.
The UI on this TV is powered by Tizen 6.5 Operating System.
For display connectivity, Samsung has provided three HDMI 2.0 ports and one HDMI 2.1 port on this TV.
To connect USB devices, it includes two USB ports. Other connectivity ports include — 1x RS232 (C), 1x Cable/Antenna In (F-type female) and 1x Ethernet RJ45.
For connecting to this TV wirelessly, the manufacturer has provided Wi-Fi (5Ghz + 2.5Ghz), Wifi-Direct, Bluetooth and DLNA.
Speaking of power consumption, on average, this TV consumes around 106W. On standby, it uses 0.5 W.
Both 110V and 220V lines are supported on this unit.