I'm not sure if you found a mount and lens yet, but I figured I would reply to attempt to respond to the Canon lens part of your post.
I have the 24-70mm f/2.8L and I think it is a great lens. It works well with my 20D, but I am not sure how wide it would go with a full-frame sensor. The clarity and crispness of the images I have taken with this lens have really impressed me, and made it worth its price.
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