The new Voigtlander HELIAR Vintage Line 50mm f/3.5 VM lens is currently in stock at B&H and Adorama. You can see a few sample photos taken with the lens at the Japanese website DC.Watch. More sample photos can now be downloaded here. The technical specifications can be found here.
This lens has been on the market for years. It came with the Bessa R2S Nikon S-mount rangefinder as a special edition and many people just adapt it using the Amedeo adapter to M mount.
Three more close-up pictures of the lens:
Pictures credit: DC.Watch