Earlier quoted context omitted.
This must be highly subjective, because for me, 65" 4k tv 10' away is like night and day to me compared to 1080p
There's no difference side-by-side between 1080p and 4K resolution if you're 5ft or further away from the TV[1], all else being equal. However, all else is rarely equal, and 4K TVs now have lots of other features and technology that make them just better (prettier) buys in general. [1] http://s3.carltonbale.com/resolution_chart.html
I'm honestly wondering if I'm an outlier and may have better than 20/20 vision. I would think it's pretty rare, but I have had people comment on my vision before. I work on a 17" 4k laptop screen with tiny text no prob.