That's similar to the experiendce I had between two different 2010 MBP 13's. I got one late in 2010 and the edges, were, to my mind, unacceptably sharp (well, I mean they all are, design-wise, in my opinion, but I mean even
within that this one had really sharp edges).
I took it back to the Apple store and two guys at the genius bar felt it and said they didn't notice anything. Regardless, they were going to let me exchange it, so it's not like they were trying to sway me -- they just thought it seemed fine.
So I opened the new-new one (another 2010 MBP 13" exactly the same model) right at the genius bar and, lo-and-behold, it was considerably smoother and less sharp. I was very pleased

I then asked them to compare, and after checking them both side-by-side even they said "Oh yeah, I see what you mean, this one
is much smoother."
Now, if they have re-desinged the edge, great, I'll not only be thrilled but will run out and buy one. But, my guess is that different plants/machines/or people (?) (not sure if people touch them) treat the edge slightly differently between the machining and when it gets anodized. And/or the metal blank is slightly different to begin with -- on my "sharper" one, the whole metal was just a tiny bit "grainer," if that makes sense. Very noticable on the top of the palm rests.