Has anyone used the Zuiko 50mm f2 with an Olympus Pen using either the Panasonic or Olympus 4/3 > m4/3 adapters. I would be interested to know your impressions of the AF speed. I've heard its slow but a users experiences would be informative. I'm not really interested in the macro focusing speed, I'm considering the lens more as a general purpose and portrait lens. Anyone know if there is a difference between the Panasonic and Olympus adapters.