Hi Carl, I don't know how much better the CA is on the Canon as it was to different reviews by 2 different people. Also my thinking was that f2.8 - f3.5 is only 1.56 or about half a f stop. To sacrifice half an F stop for a better image IMO is a plus. The Tokina did also show more vignetting than the Canon.
The Tokina did perform better than a comparable Nikon lens for sharpness.
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