Don't be too sure. Some Tokina lenses are known to have compatibility problems with some Canon bodies. Some versions of the 28-70/80 ATX Pro would not focus properly with newer EOS bodies. It is best to test the lens with the body before buying it.
my previous trail n errors suggest that tokina for EOS is not so good i nterms of AF. last time i tried a 300mm/2.8 tokina atx pro on eos 3 and te AF was sluggish. ie dissapointing. for optical quality i think tokina atx pros will be more or less ok. for tokina non atx pros ...duh.. use common sense..hehehe