« on: December 12, 2010, 08:33:35 PM »
Everything I've read says the Tokina 11-16mm f2.8 is the best APS-C ultra-wide lens out there.
"Best" in some areas, but not all. Looking at the review you linked to, the Canon seems obviously sharper in the corners already from f/3.5, while the Tokina becomes similarly sharp only at f/5.6 (and is very soft at f/2.8 ). The MM of the Tokina is very low, and the chromatic aberrations not very well controlled. I agree that the light gathering power and lower price makes the Tokina a very attractive option, but not best in all areas.