Thanks for the review, Justin. I have the 17-40L in my kit, and, it is a fine lens when stopped down. It isn't very impressive wide open, to be sure. I watch ultrawides constantly for an improvement, but, truthfully, Canon isn't exactly overwhelmed with quality UWA's. I think I might move to a Zeiss prime in the future, but, for now, the 17-40L does the trick.