My viewing distance is 36" to the center of the screen and the pixel pitch is only 0.66 arc minutes, or about 1.5x the resolution of 20/20 vision. My vision is (corrected) slightly better than 20/20 and I can't see pixels from where I sit. I can see jaggies in single pixel lines which aren't dithered (i.e. AutoCAD), but I have to look for them. 8K may be useless for couches, but on a monitor it's pretty fucking glorious.