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Hi Chris,
I have the Canon 10-22mm and it's fab. I bought it specifically for wide landscape shots and it really excels at that.
The good thing about going with the Canon (other than that it out-rates all the other, including Nikon 12-24, in tests) is that Canon DPP software takes care of any aberations.
It's also a lot lighter to carry around than the 17-55 you have!
Cheers,
Jason.
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