[citation][nom]matter37[/nom]We are at the point where jumps in resolution on these sizes of screens is not that significant, after 1080p is on most phones the resolution jumps really will just be irrelevant as it's already extremely close to unnoticeable when you go from 720p to 1080p on such a small screen, so any higher than that would be pointless other than for marketing saying "this phone is better" which will happen in the future[/citation]
I think once you reach the clarity and quality of the iPhone's display higher ppi, etc. are unnecessary. However, I think even my S3 isn't quite there yet, though I have no complaints whatsoever.