I agree that way too many 1911's have sharp edges. I believe it is a result of polishing as a final step. On the 1991A1 I got a few years ago, the bottom edges of the slide were like a razor! (Bad for you, and not so kind to holsters, either.)
Since it was stainless, it was relatively simple to "dehorn" it with a fine stone. For blued or other finishes this is a little difficult, unless you want to pay to have it refinished...
I can't remember all the edges I touched up, but I know I got the slide(bottom edges and front "corners"), as well as the sides of the hammer. The mag well had some really sharp surfaces, too.
The Combat Commander I got in the 1970's didn't have any of these problems, but that was when Colt paid a little more attention to fit and finish.