You asked
What are the alternatives to the leica summilux m 35mm f 1 4 asph?
If you want the same Leica M system at a different field of view, the two other Summilux-M primes are the obvious swaps. The Leica Summilux-M 50mm f/1.4 ASPH gives you a standard view, and the Leica Summilux-M 28mm f/1.4 ASPH goes wider, which suits streets and interiors. Both are full frame lenses for Leica M bodies, like the 35mm.
If you want the 35mm look for less, the portraits guide recommends a 35mm f/1.8 or f/1.4 for environmental portraits and groups. It also points to the 50mm f/1.8 as the cheapest great lens for people, if you only buy one.
Written by Claude from this site's pages.