Thanks for the review Michael. I bought one of these the day I saw Philip Bloom mention it. I was also impressed with the things you mentioned, and I was surprised at the image quality (on a GH1) wide open (although I have been using it mostly for video). I have an f1.0 Noctilux, which another photographer is using at the moment, but my sense is this Voigtlander is sharper wide open than the Noctilux. I could be misremembering, or seeing what I think is higher contrast at these apertures from the Voigtlander.
Have you tried it on the GH2?