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Hi, I have the Canon 14mm L II and it wipes the floor silly with the 16-35mmL I and II and the 17-40mm L. It isnt even close. The 14 is extremely sharp. I think its the best 14mm lens made.
There is virtually no question that a prime can be sharper than a zoom, and that the 14mm is a fine lens. However, better in one area such as "sharpness" is not necessarily the whole story. Obviously, if you need 14mm and only 14mm and can deal with functional issues of the 14mm lens (e.g. filters, etc) then that can be the exact right choice. On the other hand, if you need some versatility to shoot at FLs other than 14mm, want to easily use standard filters, and so forth, the 16-35 will get you the same f/2.8 aperture and produce very good image quality and the 17-40 will also produce very fine image quality and excel at small aperture photography.
The idea that one lens is The Best Lens regardless of all of the factors that affect how one will use a lens is short-sighted. For four different photographers with different needs and priorities, it is quite possible that each one might find that a different lens is the best choice.