The Voigtlander Nokton 50mm f/1.5 is an great rangefinder lens. I have used it a lot on my Leica cameras and on the Sony A7s is a perfect match, due to its image quality and small size. My Nokton 50mm f/1.1 is a more specialised lens but it is a lot heavier and I find the image quality of the f/1.5 to be better. My version of this lens has been discontinued, Voightlander has released a new version.
Images below were taken with the Nokton 50mm f/1.5 lens.
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