I'm considering the 35 1.2 more or the 50 1.1. If i eventually get an M9 i know that is useless at high ISO so a fast lens may come in handy when needed
There's no live view on the M9. You get used to framing the 40mm using the lines that do appear in the rangefinder. With the M9 you can always switch to the 35mm lines and compose just inside those.
i've read great things about it but apparently Leicas don't have 40mm frame lines in the rangefinder!