Until i see the S4 display put the screen on your list also,as neither the S3 or the Note 2 screens can compare to my DNA,and the one has the same screen a little smaller.My GS3 to GS4 comment was not meant to minimize any improvements that undoubtedly exist between the two. What I meant is that a quick look at the two phones doesn't show much difference.
The One, on the other hand, has a look and feel that separates it from other HTC phones (and other phones in general). Beyond that, I think that the camera, Zoe mode, Blinkfeed, and the loud, front-facing speakers are easy talking points which set the One apart from the competition.