8 out of 10 points and recommended
I bought this lens to shoot with my 20d, and to replace the Canon 17-40 f/4 D lens I had been shooting with. I simply needed to go wider.reviewed October 20th, 2005 (purchased for $500)
I did moderately extensive testing, shooting in cloudy conditions at various apertures and focal lengths, comparing the two lenses. The purposes of this was simply to see if I would keep the Tokina or not. I don't remember exactly the restults of each and every comparison, but the Canon was clearly sharper. However, the Tokina did well enough, and I decided to keep it.
I've been shooting with it for a few months now, and am quite happy. The build is very good, the autofocusing is as fast as the Canon, though it's wider and I'm not sure how that factors in. It's about the same size and weight.
Noticed some slight CA in the lens, but not enough to bother me into going back to the Canon. Evenually, I'll try to purchase a 5D and go back to the Canon, but for now I'm very happy with the Tokina.