If I "roll" my thumb over the side of the phone in normal use (pretend you were "swiping out" from the middle of the screen until your thumb totally leaves the surface), I can feel the edge of the plastic housing sticking up just a tiny fraction of a millimeter above the glass.
I'm assuming everybody has this? For me, it's the only thing about the whole device that doesn't feel "premium". I come from a Galaxy S2, so in a way it's better (the S2 edges had a chrome plating that chipped off, which felt gross) but in a way it's worse (at least they were never "sharp"). I figure I'll get used to it, and maybe they'll wear a bit smoother with use.