restorer-john
Grand Contributor
1920x1080 is fine for me. I don't really care much about giant TV screens, watching live sport, or having way too many superfluous pixels.
A more relevant test is to put on a 1080p resolution test pattern on a thumbdrive and plug that into your TV. Then switch to that input and display it. Stand close to the TV and then take steps back until you can't resolve 1080p. If you sit farther than that, then you have no hope of seeing any resolution beyond that. Ditto for 4K/UHD resolution.Get two phones, or two tablets, one with a resolution of 720p and the other with a resolution of 6K. See if you can see the obvious.
Marketing. I'd rather have lossless 1080P.
"Upsampling" that actually improves picture quality usually is more than just interpolating extra pixels. You can add all sorts of thing like temporal smoothing and sharpening to clean up compression artifacts and make the result look closer to the display's resolution. It's usually not any better than watching it on a screen of the native resolution though. Upsampling is pretty much just something you do to make old content fit a new screen better.
4K is already excessive unless you you sit super close to an absolutely giant screen so I'm unsure about how upsampling 4K to 8K could improve things unless something was already broken to begin with.
I have fairly intensive AviSynth script I use to upsample SD content to 1080P that works quite well, but I dread having to get even a 4K TV because of the extra processing power it will require.
iPads have 5K resolution...some. MacPros look very nice @ 5K.
I'm ready for 8K. It's like music playing from a hi-end turntable perfectly calibrated with its tonearm and cartridge.