I'm a rangefinder enthusiast, but no interest in fast lenses any more. The fastest I've ever owned was the Nokton 1.1, even when I could accurately focus it (which was rare), I just ended up with the usual paper thickness of focus and everything else a blur. I know that's the point of such lenses, but I don't really see what I'd do with it, as in, what practical application is there for such a small DOF?
And of course the Nokton 1.1 is massive, probably over twice the size of a Nokton 1.4, for less than a stop more of light.
So, no, not for me...