I was tempted by the 35mm 1.4 again and again, and was put down by the distortion that is apparent in a few samples I saw. I know it's only in few samples, still, it annoys me. I had an otherwise excellent Canon 50mm 1.4 that I sold due to its distortion (Not sure if I was right to sell it, though)
I decided against it the nokton, and have now a hex-M.
I know it's limitations, namely, size, and f/2 but at the end, I prefer excellent IQ, build and handling to an additional stop.
Also, I have been burnt several times by the iffy Voigtlander QC, and try to avoid them.
Last, I'm not a "Dark" shooter, and most often, Tri-X gives me f/2 at 1/30 in regular lighting, which is enough. I will also propose that a Tom Abrahamson soft release can give you an "additional" f stop in terms of speed and camera stability.
When really in need, I just push TX to 800...
All that being said, I am sure all this is very personal, and if there were no alternative to the Lux 35 but the Nokton, I would most probably be perfectly happy with one.
good luck !