I've found this combination to be pretty sharp, especially considering there's a 2x.
But I have noticed that if I am in continuous focus mode, with SH2 at maximum, even though a subject may not be moving very fast at all, sometimes the images are a bit out of focus.
Has anyone else encountered this? Is a solution to step down from 50 fps to 25 or even 10? Or maybe leave at 50, but do single focus and rely on depth of field?