Thanks guys for the answers.
I plan to “complete” the lens system by selling the 17-85 and buying an ultra wide, an EF 24-105 L and an EF 70-200 L. Then with my 2 primes, 50 f/1.4 and 100 f/2.8, and the lenses above I may rest for a while.
Because I’d like to have the 24-105, and in the absence of the 17-85, I think I’ll need something that gives me the equivalent 30-35mm.
Thanks for pointing that out (the 10% difference). In the projects that I have in mind that could be significant.
I really appreciate the caveat about the flares, here there is sun everywhere 8 months a year, sometimes it feels like the sun is a double, and one can’t get away from it.
So in conclusion about Tokina
-more geometry distortion
Hmmm, it looks like only Sigma and Canon remain in competition.
The main thing that makes me hesitate concerning the Sigma is what I’ve read in Thomas’ review about QC.
With the dealers here it’s hard to test a lens before you buy and returning it is problematic at best when it’s about IQ and not some physical/mechanical fault.
Canon PowerShot S100
Canon 50D , SIGMA 10-20 f3.5 ,Canon EF 24-105 L IS USM, Canon EF 100/2.8 macro Canon EF 50/1.4 ,Canon EF 85 f1.8,Canon EF-S17-85 4-5.6 Old Tamron 28-300 inherited from my Canon Rebel G film camera