We have received our Canon EF 11-24mm f/4L and we're over the moon about it.
I'm heading out this weekend for some winter landscapes to try the lens out. I'll also be using it at the end of March for 10 days shooting the Isles of Skye, Lewis & Harris in Scotland. After I've completed that photo tour, I should have a good amount of images and field work for a review.
I've shot 12mm on Leica before, but I'm hoping this goes a lot better than that experiment did.