You asked
Olympus m zuiko 12 45mm f 4 pro vs panasonic lumix g x 12 35mm f 2 8 ii?
Both are Micro Four Thirds zooms with autofocus, and both fit the same bodies, so the choice comes down to what you shoot.
I'd pick the Panasonic Lumix G X 12-35mm f/2.8 II for most people. It's brighter at f/2.8, it's stabilised, and it frames like a 24-70mm on full frame. That makes it the better choice for low light and handheld shooting.
The Olympus M.Zuiko 12-45mm f/4 PRO reaches a little further, to about 90mm equivalent, but it's f/4 and not stabilised. It suits good light and situations where you can slow down, such as using a tripod.
If you want a brighter option for portraits, the Olympus M.Zuiko 45mm f/1.2 PRO is a different kind of lens and a separate purchase.
Written by Claude from this site's pages.