You asked
Is the olympus m zuiko 12 100mm f 4 is pro good for landscape?
Yes, it's a sensible landscape lens. On Micro Four Thirds its 12mm wide end frames like 24mm on full frame, which is wide enough for most scenery, and the f/4 aperture gives plenty of depth of field for front-to-back sharpness. The 100mm end is handy for pulling in distant ridges or details.
Because it's a stabilised zoom, it also works if you hand-hold, so it covers more than a tripod day. Good bodies to pair it with include:
Landscape work is slow and tripod-friendly, so the camera choice matters as much as the lens. See landscape for what to look for.
Written by Claude from this site's pages.