There also is a line of Sonnar lenses available for the Rolleiflex SL 35 series. Some of the Voigtlander lenses are Sonnar variants -- the Skoparex, I believe, is among these. I'm referring to the German Voigtlander (not Cosina Voigtlander).
I'm not sure what the Ultron, Nokton or Septon were (again, German Voigtlander, not Cosina Voigtlander).