I currently have a 20D (now a back up) and 5D Mark II (main body) and I use the 24-105 f/4L a TON. Much more than I thought I would initially. It pretty much stays on the camera now. I mainly shoot outdoors (some indoor) on a tripod with occasional motorsports (mainly drag racing but its rare).
I have been thinking of getting something a little wider and I have been eyeballing the 17-40 f/4L for a while now. Is the 7mm going to make that much of a difference on the 5D MkII?
I have a few other lenses in my bag but mainly use the 85mm and 135mm when I take the 24-105 off. Does the 17-40 seem like it would fit with what I have now and the "want" to go a bit wider?
I really want to stay with Canon lenses but could be swayed if there is something out there that is on the same level as far as IQ goes.
Just trying to make sure I am thinking in the right direction and would appreciate any insight anyone would like to provide.

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