This is a modified Kowa 55mm f/1.0 lens. You can use it on your Micro Four Thirds camera without using any adapter. It is currentlz for sale on eBay (Click here). Didn’t find any image smaples taken with that lens :(
A High quality alternative is the Canon 50mm FD 1.2 (Click here to see current auctions on eBay)
P.S.: As you might know Kowa announced that they will be making the 350mm f/4, 500mm f/5,6 and 850mm f/9,6 telephoto lenses for Micro Four Thirds.