These are new versions of the previous Voigtlander SL 40/2 and the limited edition Cosina made Topcor 58/1.4 of a few years ago (produced in chrome for Nikon AIS or Pentax M42 mount). The superbly performing Cosina made Topcor 58/1.4 is popular and very sought after in Japan. Unfortunately it sold out too quickly for most other markets to be very aware of the lens. and See previous versions here http://www.cameraquest.com/Voigt SL.htm
Although the new SLII lenses have the same glass as the previous versions, there are very important differences:
1) both are chipped for full metering capacity with digital SLR lenses. This is a first for Voigtlander Nikon mount lenses. While covering the full frame 35mm format, they are also ideal fast lenses for Nikon digital SLRs. With Nikon discontinuing most of their manual focus single focal length lenses, Mr. K once again offers lenses not available elsewhere.
2) Both new lenses are available in black only. The new version 40 now includes the interesting dome lens hood (previously sold separately) and a close up lens. the 58's lens hood is sold separately (previously included)
3) SLII lenses are so far announced only in Nikon AIS (with metering matrix chip) and Pentax KA mounts. Voigtlander did produce the now discontinued 125/2.5 in manual focus Canon EOS and Minolta AF mounts, with the needed metering chips. Unfortunately neither sold well, so it remains to be seen if Mr. K will make more lenses in those mounts.
4) Despite some speculation on RFF, the Voigtlander lens designs and Zeiss lens designs have nothing in common. Both product lines are the results of different design teams.
5) $379 for either the 40 or 58, $39 more for the 58 lens hood.