I cant speak from expierence cause i do not own one. But from the picture archive threads of each lens there is really no comparable difference at all in IQ between the canon and sigma. OF course with the canon it goes to 3.5 and the sigma 4 but that isnt a really huge difference. So id say your prolly golden with whatever one you buy.
I will make a suggestion though taht is worth checking out. Ive herd a few people say they have liked their 11-16 F/2.8 Tokina lens. The 2.8 is very nice and useful as you prolly know shooting with the 24-70 and 70-200(saying your 70-200 is the 2.8 version). And that 4 mm on the zoomed side of things that you loose from 11-16 to 10-22 is fixed by taking about one step forward...
So, id say its worth looking into for sure! Ive seen some very very amazing pics from all lenses.... Ill share some of my favorite for you...
This is a pic from the Tokina 11-16 f/ 2.8
This is a pic from Canon 10-22 f/3.5-4.5
Last but not least... The Sigma 10-22 f/4-5.6
So you can see for yourself, the IQ and color and everything is very nice on all the lenses....
Hope that helps you out at all...
>Chris.
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