20/20 vision is by definition average. I'm a little better than that, but when I say that the difference between 1080p and 4K is blatantly obvious, I have confidence that it will be just as obvious for the average person reading this.
I also find the difference to be blatantly obvious.
I checked out the 4k TV display at an electronics store, and I was floored.
Unfortunately, at least for upgrades, my current set still works (and I hope it keeps working for a while).
The next one will have to be bigger... 63" isn't big enough. So glad I didn't buy a smaller set.
Viewers can't tell the difference at normal viewing distance, you have to be close, like 5 ft or less. That's why video stores arrange them so that you will be close to the screen. At 10 ft, it makes no difference.
But, but 9VIII is a special person who can resolve 0.05mm from 3ft away. So it must make a difference to him.