I have the 24-105 on my 40D and I'm happy with it. I don't have a FF (yet) so I cannot compare IQ.


I can't help but mention the 24-70 (sorry) because ever since I got a 70-200 f2.8 I've questioned whether I would prefer that lens. At the time I purchased the 24-105 it was on a whim and I had no intention of investing too much money into photography equipment (how times change).


I have found occasions when I'd like something wider but as a general purpose lens I think it's excellent.