Of course! 640p compared to 720p is SOOOOO easy to notice. But 720 or 900p compared to 1080p isn't easy... 

Go figure.

Or, you know, glasses...

Also, no need for such huge TVs. It depends on the distance too

Yeah I mean I fully admit that I noticed the blurriness of PS3 games like RDR and CoD, and the resolution difference there was considerably smaller.

Could be I'm near sighted and even with glasses I don't have 20/20 vision as do most people that wear glasses.  On top of that I only have on TV set where the difference would be easy to spot all my other sets a 32 inches or less.

One more quick note, there won't be many more 900p games let along 720p as developers become more familiar with ESRAM and programming against it (similar issues they had developing against the Cell Processor). I also read (yes I know believe everything you read online, lol) that the initial developer kits for the XB1 were horrendous compared to the competition of which they recently (some time this year, sorry for no specifics) corrected that so hopefully games will be developed at 60fps and 1080p going forward as much as possible so this discussion can finally be put to rest.

Side note - For the record, I did some testing amongst my friends of a side-by-side comparison of Tomb Raider on the XB1 and PS4, 15 out of 16 picked the XB1 screenshot even though I asked them to pick which one was which and they thought it was the PS4 version so we can debate this forever and it really doesn't matter because if it really did, we all would be buying $2,000.00 graphics cards and building insanely powerful gaming rigs.

To Each Their Own I suppose! Happy Gaming all!

Not native. And a very small amount of people said it looks blurry, but still believed it was native 1080p as Sony had told them. So like I said, "seems most cannot".

Can gamers tell the difference?

Microsoft's own executives confirms to me that no, seems MS cannot.

More evidence. Thanks.

np, I'll always share evidence of incompetent executives.  :)

I never denied a very small amount did. I said most did not.

Especially here, most (if not all) did not.