Got it in the mail today. Walked around the neighboorhood to take some shots. I am surprised by the quality of the images this lens produces. The autofocus is noisy, but it isn't louder than the shutter. It is much faster at focusing than I would have thought, and quite accurate.
Here are some of the shots I got with my 5d III and 50 1.8 today.
Untitled by johnstondox, on Flickr
5D mkIII + 50mm 1.8 @ f1.8 1/2500 ISO 100
Untitled by johnstondox, on Flickr
5D mkIII + 50mm 1.8 @ f1.8 1/3200 ISO 100
Untitled by johnstondox, on Flickr
5D mkIII + 50mm 1.8 @ f4.0 1/1000 ISO-100