davidearls Offline Upload & Sell: Off
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I had the 10-22 when I had my 20D, and took the forced upgrade to the 17-40L when I moved to the 5D. For my money, the 10-22 was the better lens - sharp corner to corner and all the way through the zoom range. The 17-40 is a great lens up to about 28mm, then it starts to get a little soft. The 10-22 on a crop body is approximately equal to the range of the 16-35L on FF.
I never shot with the 17-40 on a crop body; the crop may solve some of the IQ issues, but then it introduces the crop - so you're not as wide.
FWIW, for wides, you might want to check out manually focused lenses, like Zeiss, Leica, Olympus, etc - Wide isn't Canon's long suit. MF lenses are a lot less expensive than AF lenses because they don't have electronics in them, and when you're shooting wide, AF is of dubious value. And they'll work on FF if you ever upgrade your camera body.
My $0.02, others' mileage may vary...
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