If you had a Nikon and wanted to later buy a full frame camera, then the Nikkor 14-24 mm would be the best choice, but so far, Canon has yet to provide their 5D and 1D camera users such a nice wide angle lens. The widest for a full frame Canon would be the Canon EF 16-35mm f/2.8.
I have 3. The Samyang 14f2.8, the Canon 15f2.8 fisheye and the Canon 16-35f2.8L II. Canon also produce the 14f2.8L II and the 17-40f4L.
Out of my 3 the 16-35 is the most versatile and really comes into its own on the 5DM2 but I wouldn't recommend it on the crop, nor the fisheye. Surprisingly the Samyang gets good ratings on APS-C sensored DSLRs. It is excellent value for the price.
http://www.photozone.de/canon-eos/533-sa...
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