17-40 L or 24-105L for landscapes

Neither lens is a replacement for the other. If you are ONLY going to shoot wide landscapes then, of course, the shorter focal lengths would be useful. If you want to throw in the occasional portrait then not so much.

I added the 17-40 to my 24-70 and 70-200 f/2.8s for my 5DII and 1DIII and am glad I did. I wouldn't choose it over either of the other two, however.

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