Many thanks to you all for your thoughtful responses. I have Leica film cameras, so I am familiar with the pleasure of handling such a fine tool. My use of the GXR M mount has wetted my appetite. I am happy with the results I am getting, but if I can achieve even better quality images with my Leica lenses, that's where I want to go. \My "take away" from this discussion is to wait to see if Ricoh will announce its intention to provide an M mount with a full frame sensor in the near future and, otherwise, to bite the bullet and go for the Leica M or M9 (aka ME). Regards.