Gary's tests are pretty representative, IMO:
http://zone-10.com/cmsm/index.php?option=com_content&task=category§ionid=10&id=45&Itemid=97
He tested both SC and MC version of the 85/2.
Compared to my RF glass, non of the Zuikos that I tried is really "sharp" wide open. For example, my Ultron 28/1.9 has noticably higher resolution and less distortion at f2 than my 28/2 Zuiko. And the 28/2 is one of the sharper Zuikos, with floating element. My OM Zuikos all tend to be on the soft side wide open, with medium contrast and beautiful bokeh, and get very sharp when closed down, usually optimal around f5.6 or so. Then however, they really bite. The 85/2 is no exception, IMO.
Roland.