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I used the Canon 10-22 mm for several years on my 20D before I got my 5DmkII. I now use the 5DmkII + 14 mm combo as a replacement for the 20D.
The 10-22 is excellent - I don't recall any CA problems at all (even with the sun in the scene, or objects silhouetted against sunlight), though I tend not to specifically hunt for problems.
By the way, even my 14 mm has distorted stars in the corners... even if the lens was theoretically "perfect", a rectilinear projection at 14 mm full-frame won't show perfectly round stars in the corners (everything looks distorted).
Have you considered a fisheye, such as Canon's 15 mm f/2.8 or 8-15 mm f/4 zoom?
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