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I own one of these lenses, and they work fine during the day but don't expect to get good results at f2.8 at night. There is significant coma toward the edges which means a fair bit of the wide angle has to be cropped to leave round stars. I've used it stopped down to f5.6 and the results are better but coma still exists at the extremities. Personally, I wouldn't buy one for astro photography unless you are prepared to increase your exposure and use larger f stops to eliminate the aberrations. They certainly give wide fields but are not suitable for a full frame DSLR as the image they produce just covers a cropped sensor. Don't know about the Canon 10-22mm, it may perform better.
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