You asked
Olympus om d e m1 mark ii vs olympus pen f?
I'd pick the E-M1 Mark II for fast action. It's a weather-sealed pro body with quick autofocus and bursts, and it's still a capable used buy. The PEN-F suits slower, more deliberate shooting. It has a rangefinder-style body, a built-in viewfinder, and a front dial for colour and monochrome profiles.
Both use the same Micro Four Thirds sensor at about 20 megapixels, both have in-body stabilisation, and both take the same lenses. So the choice comes down to handling and how you like to shoot. Either body pairs well with the Olympus M.Zuiko 25mm f/1.8, which frames like a 50mm on full frame, or the Olympus M.Zuiko 12-45mm f/4 PRO if you want a zoom.
Written by Claude from this site's pages.