Super examples Dan, and the Sonnar one sort of blows out of the water what I was going to say about that lens.
But for the record, as I understand it the Sonnar is designed to render a slightly diffused image wide open, to give the classic glow of earlier lenses. This settles down at around f/4 to render images in a modern way. Some people like it, some don't. I like it from images I have seen, but your photo looks every bit as 'modern' as any other lens. Much post processing going on?
I will add to the recommendation of Reid Reviews, it offers a no-nonsense and real world review of lenses and 'fast 50's' crop up often. My position is that once you go beyond f/1.4 your are into the limiting aspects of very fast lenses, the very narrow DOF can be more difficult to work with in low light compared to slower lenses, with the focus becoming so critical you can have more chance of getting a sharp image hand held at 1/8th second and f/2.8 than trying to focus a Nokton at 1/60th at f/1.1. This is particularly so as the Nokton does exhibit some aperture related focus shift, although when I had one it wasn't as bad as I expected.
Personally from the ones you mention Moonshine I would say the f/1.5 Nokton is a good enough fast lens, and a very good day to day lens. If I threw a wild card into the mix, then the 40mm Nokton f/1.4 is a very nice lens (and very small) and the image fits the M9's 35mm framelines very closely, although you would need to file the lug on the lens flange to bring up those framelines (a camera tech could do it while you wait).
Steve