Here's where NOT to use this lens.
This is the most hideous bokeh it's produced for me yet. The outlining almost looks like multiple exposures.
Avoid wide apertures with contrasty stuff in the transition zones, especially at or near min focus distance.
I've encountered plenty of other horrid bokeh scenarios with it too, usually at wider apertures it seems, but not at all focal lengths or distances.
Exhaustive testing won't be performed, just cursing when I see the results back on the computer.
Good thing this lens has plenty of redeeming qualities like incredible sharpness, speed and a great IS.
Here's a non-cropped shot from my 5D2
1/160s, f/4, 200mm, a few inches beyond min focus distance.