[asadotzler]

For people with good vision, a 4K 6" screen held 18" from the eyes will look better than a 1080p screen, all other factors being equivalent. Held further than about 18", 4K won't make a a difference for most people.

For a 60" TV that sits 10 feet away, you're not going to see much difference. Move that TV to 4 feet away, and you'll appreciate the extra pixels.

For virtual reality, and other applications that put the screen much closer to your eyes, the extra pixels will make a huge difference.

It's all about the viewing distance.

[danmaz74]

I completely agree if you talk about virtual reality, but here we're talking about VP9 or HVEC compressed video, which will also need to be resampled as the display isn't 4k but something in between 1080 and 4k.