The Canon 24-105 is selling for $600-650 new, do you feel the Sigma is worth the 40-50% price premium?
Depends on your wallet... the 24-105L could go to $450 and that would not take away from what the S24-105 can still do. It's worth the money... and probably a good $200 more worth it for me. If I made money off this, I'd get a 24-70L or wait for the IS, but apart from that, I like it very much. I was on a speed boat going quite fast, snapping shots as we went along, I got almost no blurry shots... AF nailed, OS nailed. Great product.