Thanks for the comments.
Many times I don't like the boke of this lens that much - but at other times it can be complimentary to the subject matter. It can definitely be swirly!
I find that a very busy background that is close to the subject can give the strongest vertiginous effect. If the background is further away, or if it is at night and more specular in nature, the coma driven boke can grow on you.
As for sharpness, I don't find it the sharpest lens around (though the flowers at f2 are pretyy good!) - maybe a bit better than my old type1 50 Lux. As Charlie pointed out - the DOF is extremely thin and it is very easy to miss focus on near subjects - even imperceptible leaning or swaying on the part of the subject will be a problem in some cases. This is MUCH more of a problem with digital than film, in my experience.
BTW, I did the conversion myself and am still doing some fine tuning of focus, I need to decrease my shimming ever so slightly to reduce front focus. I may at some point send it off for final tweaking, but it is mostly just for fun now.
And Fred - nice shot, but I think your focus is on the near edge of the umbrella, rather than the face, if I see it correctly. So easy to do, especially with a subject that is moving!
