You asked
What are the alternatives to the leica summaron m 28mm f 5 6?
I don't have a direct lens alternative to the Leica Summaron-M 28mm f/5.6 on this site. Its page lists only the Leica M bodies it fits, so I won't guess at other lens names.
If you want a 28mm view without a Leica M, the closest pick I can point you to is the Ricoh GR, a fixed-lens compact with a 28mm equivalent that fits in a trouser pocket. You can see the rest of my street options on the street page.
The Summaron is slow at f/5.6 and manual focus only. If you shoot in dim light, the aperture guide explains why a faster lens helps.
Written by Claude from this site's pages.