We figured we'd take a Leica APO-Telyt-Modular R 400mm f/4 and modify it for use on the Leica S2. Yes, it works! Yes, it's sweet!
Check back soon for the results of our in-depth testing and lots of sample images. We're going to have fun with this one.
Update: started a discussion thread in the forum and uploaded an image or two from yesterday's test shooting