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I bought the 10-22 in order to replace my Sigma 15-30 and gain some additional range in the wide angle side as well as getting a more compact lens. Unfortunately, when I compared shots to my Sigma between 15 and 22 mm, I found that center sharpness was inferior with the 10-22. However, edge sharpness was better with the 10-22 than with the Sigma. I then compared my Canon 24-70 at 24 mm and TS-E 24MM to the 10-22 at 22 mm and found the sharpness, not surprisingly, to be less than either of those lenses as well. Since center sharpness was most important to me, I decided to keep my Sigma 15-30 for now. As far as CA and lens flare, the Canon 10-22 was better than the Sigma 15-30. It's really a nice little lens in all respects except center sharpness.
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