It's a really nice product but the downsides are:
-Oval shape specular hightlights
shown on this video at 6:22
https://www.youtube.com/watch?v=tVOhac0FQkw
(correct me if I'm wrong but even thought in this test it isnt the M4T version, I presume it has the same issue)
-Slow autofocus (dont care much for video)
-"Onion ring" bokeh (we can see those on the first image Andrew posted) I find that this very disapointing.
am I missing anything?