Just got my new 17-40 f/4L lens to add wide angle capability for my 5D3. Now I can go wider than the 24-105 f/4L kit lens. Looking forward to running AF MA tests to see how it performs.
A first for me: the 17-40 was packed with a "EF lens" CD that has PDFs of user's guides for all Canon EF lenses. Saves Canon from publishing handy booklet size guide that can be easily stashed in my camera bag. Lens User Guides don't always have much in-depth info, except for speciality lens, like macro, tilt, etc. With PDF substitute, not as convenient as booklet size I've gotten with my previous lens purchases. Another cost-savings move by Canon.