I was hesitant about buying a lens on a crop, but comments like that make me reconsider. I've been through the 10-18 and 10-22 galleries already too. I guess I'll give the ultrawide a shot. Thanks!
I'd suggest the 10-22. It is 2/3 stop faster than the 10-18, has a way more useful focal-length range, and vignettes less. The advantages of the 10-18 are price, and STM, well OK, size.
I upgraded from 60D/10-22 to the 6D/17-40. It was a noticeable improvement. The catch? I moved into full frame whole hog. That was moderately expensive. If you only want to get access to UWA, go 10-22. The IQ difference between the two setups is not worth the cost just for UWA.



