I can't notice a difference, really. I mean maybe slightly, maybe, but not enough to drool over. At least not with my 52" Samsung and/or my old ass eyes.
They say you should have at least a 50" to enjoy it, but yeah, I see no difference in quality from my HD to 4k. I guess if I had a 60 to 70 inch system, moved my couch a lot closer or maybe bought a better tv than I currently have (?)
it would work out better for my eyes (ha, well better in so much I could better see the sharper image, not "better" for my eyes). A larger tv would just envelope the entire room, I am already close enough to my tv as it is. Oh, and I really like my Samsung.
Don't get me wrong, if the wife wasn't here I would probably be sitting about 3 feet from the tv to better see all that higher-res goodness
But yeah, my eyes are as old as the rest of me, well, technically not but still
, so I am sure that is more the issue than not.
Enjoy that sweet, sweet stuff while you can youngins