Quote Originally Posted by Jon Ruyle
Wait, though- it isn't surprising that the Canon would be sharper wide open. Correct me if I'm wrong, Daniel, but when you said the 17-55 was sharper, did you not mean that it would be sharper at the same f number?

Actually, I meant both. I found the 17-55 and 17-50 to be so much sharper that even at f/2.8 they could beat the 24-105, and at f/4 it was an even bigger difference.