@Chris_88, thanks for your input on lux 50. It may seem silly but I take pictures of kids mostly and after day is over, in side I shoot any lens wide open.I miss the focus on many but still its rewarding. From what I have read the lux is simply very good at 1.4. I never did before, but I have , for reason or not, feels something is special in M lens in the picture. Damn, my wife is correct very often when she says "is this from leica?".
I can hear you. I'm a big fan of that look, too. I actually prefer the slightly cooler color rendition and the Mandler bokeh of my Elmarit 90 to the slightly warmer Minolta colors or the color sucker punch of CV lenses. If you can afford the ASPH Lux, then I'd say go for it, otherwise you will always wonder what if. Is there any chance you could rent one before buying?
Of course, with Leica you will always have that endless discussion between those preferring the look of the old Mandler lenses versus the new ASPH designs by Peter Karbe, e.g. pre-ASPH vs ASPH Lux or 75 Lux vs 75 Cron. In the end, it all comes down to taste and personal preferences.
I'm still thinking about adding a 75mm prime to my collection. Problem is that I find the Lux 75 too heavy, the 75 Cron's focus throw too short, the MFD of the old 75 Summarit (the 2.5 version) too long and the color rendition of the CV 75 1.8 is not to my taste. The new Summarit might be an option, though.