Just upgraded to a 50d and am contemplating upgrading my 28-135 w/ a 24-105L. I've read alot of good things on this lens, but recently came accross a couple threads on another forum bemoaning this lens on crop cameras. Hmm... if I'm going to shell out L prices, I want to be sure the sharpness is going to be excellent on my 50d. Any thoughts from those using this lens on one of the xxd models? Thx.


