I'll try and do some photos of a blued 1927 soon. They do tend to have sharper edges than Colts and usually have linear sanding marks, IIRC. It's been a while since I really scutinized one though.
But as an initial reaction, I'm thinking you did quite well!
The main thing that I don't like about 1927s is the long hammer spur with the sharp rear edge. Downright painful to shoot for me as the web of my hand gets pinched something awful.
(Which, BTW, is virtually the identical hammer used in the Colt WWI reproduction pistols they did a few years back. The pistols were so similar in certain areas that I suspect(ed) that Colt had the bulk of the work done building the pistols in Argentina!)