This is interesting. We had a rep from Tokina's UK distributors visit us yesterday, hoping to persuade us to stock Tokina lenses. One of the issues we had was that, except for a couple of unique lenses which they make (11-16mm f/2.8 and 10-17mm fisheye zoom), we've hardly ever heard of anyoone using Tokina lenses - and therefore have no idea how good they are, how attractive to punters they would be, etc. The lack of response to this thread seems to confirm that.