You asked
Is the olympus m zuiko 25mm f 1 2 pro worth it?
Yes, if you shoot Micro Four Thirds and want a fast standard lens. The Olympus M.Zuiko 25mm f/1.2 PRO is weather-sealed and frames like a 50mm on full frame, a natural view for people, street, and low light. At f/1.2 it gives about the depth of field of f/2.4 on this sensor, so you still get a soft background.
It isn't stabilised, so keep that in mind for slow shutter speeds. For why a 50mm-style view suits portraits, see the portraits guide. It fits a long list of bodies, and these are good places to start:
Written by Claude from this site's pages.