I already had a range of Voigtlander lenses from my R3A and R4A bodies when I bought my M6. I mainly use the CV 35/1.4 on it. I sold the R3A with its Nokton 40/1.4 but kept the R4A as I like to shoot wide and the R4 cameras have frame lines from 21mm top 50mm. The M6 stops at 28mm and has a frame for 135mm which I'll never use.