rxmd
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I'd like to get another fast 35mm m-mount lens, to complement my nokton 35mm f1.2 (my main lens).
I don't think I understand what you mean by "complement"; I normally understand a "complement" of X as something different from X that does something that X doesn't do. Another fast, big 35 won't do anything your fast, big 35 doesn't do.
It sounds a bit like you're mainly collecting fast lenses in order to be in the possession of fast lenses. Which is fine as a hobby, but under this kind of premise there is really no difference between a Leica, Zeiss, Voigtländer, Konica, Yoyodyne or any other lens. If you buy thing just to have them, anything is fine as long as you can have it.
If you're interested in a photographic complement, I'd get a compact, very good medium-speed 35. If you're into classic lenses, I'd recommend the Canon 35/f2.8; if you're into modern lenses, it'd probably be the Rollei/Zeiss 40/2.8. The focal length difference is negligible (one step back and the angle is the same), but the lens is very small, and quite good (from what I see and hear - never had one, never shot one).
