Got my '40 shorty' the other day, not had chance to test it properly other than a quick walk around the place where I work.
So far I've only used it on the 5D, it will go on the 7D next.
I like it, it's small, sharp and damn light.
The shots attached are not very interesting in terms of subject matter. Sorry.
All at f2.8, except the Chemicals on the shelves, that's at f13.
Recommended purchase? Yes!