A few quick words on this lens.
I've had it for about 6 years and it has never missed a beat. It's been in sand storms, storms in the north sea, rain, snow, cold, heat, been dropped. It is a very sturdy lens with extremely fast AF and compared to the 24-70 2.8 seems much better built (the hood mount is metal and not plastic, as an example). Right, words of praise. A few pictures.
16-35 @ 16MM F6.3