huh? this runs at 60fps

or do u talk about multiplayer splitscreen?

That's bull. I play on a 32" screen, am near sighted (although not by much), and I see the difference right away. 720p is quite blurry in comparison to 1080p. No need to have perfect vision to see it. Even at quite a distance from the set, I can see the difference. Just say that you can't tell the difference (for whatever reason). But don't generalize by saying stuff like you did here. Most people can tell the difference. Do most care? That is the question.

Pretty much. The fact that some can even tell the difference between something as similar as temporal and actual 1080p (despite the identical final pixel count) speaks volumes to how many will notice an actual 125% pixel increase from 720p to 1080p.

It's a simple linear scale. Double the tv size, or sit at half the distance, same difference.
SMPTE standard for 1080p recommends upto a 30 degree fov, with a 32" tv that means sitting at a mere 1.3m. Not that you can't see the difference from a bit further away. And eh, they're not blasting electrons in your eyes anymore, you can sit that close.

If you want to know how OR rift looks resolution wise, put your face 0.436 * diag away from the screen. You need to be near sighted or have a large screen to see how a 90 degree fov looks, 35cm from a 32" screen, or 57cm from a 52" screen.
(It's not the same though. Since the screen is flat sitting so close will give you a lower perceived resolution in the center than at the edges. OR uses optics to make the screen appear further away and invert the effect, pinching more pixels to the center of your vision)

Or glasses...

And no, I have a 22" screen and I can even tell the difference between 720p and 1680*1050 very easily. I'll tell you why: It's because I sit a meter away from it.

This is simple math, really. Viewing distance matters just as much as the size, since it's all about how much space it takes up on your retina.

I was talking about Wind Waker HD there. MK8 is 720p/60fps, WWHD is 1080p/30fps. I noticed immediately the lower resolution in MK8 and lower frame rate in WWHD, that's my point. If I can see the difference, everybody can, I think.

When I got a new TV I could tell the difference easy.

My eyes are fine so yes; I can tell the difference between 720p and 1080p.

Does it matter to me? Yes. That's why I started playing multi platform games on PC back in 2008.

Can I tell the difference between 720p on PS3 games and 1080p on the PS4? Do I even need to dignify that with an answer?

If anyone answers no, I can only assume their viewing distance to size of display ratio is outside of the range of what healthy human eyes can distinguish. Pull back far enough from any size display, and an upscaled SD 480p image will look just like a native 4k image on the same display once far enough out of the range of normal viewing distance.

At about 5" (60") distance, I can distinguish pixels on a 50" HDTV, so it becomes very apparent whether I'm looking at a 480, 720 or 1080 native resolution image. On a 1920x1080 computer display at normal typing distances (about 15"), anything other than a native 1920x1080 image or signal is quite obvious.

So either fix that corrective lens prescription, or move closer to the display if you genuinely can't see the difference.

If you can't tell the difference between 720p and 1080p, you're trying to prove that the ps4 isn't a better system (even though it flat out is). If you gave me a game in 1080p, I would notice if you lowered the resolution while I was out of the room. The draw distance would be worse, it would have worse AA, textures wouldn't look as good. As a pc gamer, I know this to be true. Every once in a while, my games will randomly switch resolution. My first thought when this happens is "why does my game look like shit?" If you can't tell the difference it's because you're trying to not be able to ell the difference. 720p and 1080p is a night and day difference.

I can't really and i switch between PS3 and PS4 all the time. PC is way ahead in resolution still