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Greg is right, at least at web sized images. however, to print large, it is nice though not essential to have a lens with good optical characteristics. and sharpness is only one.
I like shooting wide. I would say its a tough call between canon 16-35II and nikon 14-24 on my canon full frame, but if I were to pick one, it would be 16-35 II, b/c of versatility, over all image quality, including flare characteristic, micro contrast, etc.
For typical landscape shooting - tripod-based and not wide open - there is really little advantage in the getting the 16-35 rather than the 17-40.