Having JUST gotten a 10-22 (last friday) and spending most of the weekend shooting, I can say I LOVE this lens! Unfortunately, I can't say that about the photographer's ability to compose a shot! [:$] This lens is great, but, it's showing me just how bad a photographer I am! [] Can't say about the Sigma (last sigma I used was for an A1! Worked quite well, but.... a LOOONG time ago!).