Good afternoon,
I have recently tried the above lens on my Canon 6D, and I have to say that I am impressed. The lens is sharp into the corners, and it feels better built than previous similar lenses I have used (16-35 f2.8 and 17-40 f4). I think I will get one to use on the 6D, makes for a very nice and easy to use kit.
These are some examples from a pre-dawn to dawn session from yesterday, on my usual testing ground in SW Portugal.
Kind regards