ferider
Veteran
The comparison I'd like comment on is with the zm sonnar c. I am wondering whether I can justify adding this new lens.
The new Nokton is a very different lens, surprisingly flat field wide open (sharp across the plane) with very little shift across the aperture range. It also has 0.7m min. focus.
For bokeh, look here: http://www.rangefinderforum.com/forums/showthread.php?t=134329
Contrast feels similar between the two lenses. The Nokton has a little barrel distortion, while the my C-Sonnar (years ago) was very rectilinear.
Which is better very much depends on what you want to use it for. Only you know.
Roland.