Should I sell my 17-40 f/4L for the 17-55 f/2.8 IS?

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Thanks for the reply. Do you find that you use the 17-55 predominantly over the 17-40?

I use them differently. I have the 7D, which the 17-55 is mounted on. I use it a lot, particularly for informal portraiture and people shots.

The 17-40 L is used primarily for landscapes with my FF camera. I rarely use it at f/4. I stop it down to f/8-f/11.

I would say that the EF-S lens gets more use.