You asked
Olympus m zuiko 8 25mm f 4 pro vs panasonic lumix g 7 14mm f 4?
Both are Micro Four Thirds zooms with an f/4 maximum aperture, neither is stabilised, and both autofocus. They also fit the same long list of bodies, so the choice comes down to the view you want.
The Olympus M.Zuiko 8-25mm f/4 PRO frames like a 16-50mm on full frame. That makes it a sensible everyday walk-around zoom, covering wide scenes through to standard and short-telephoto views.
The Panasonic Lumix G 7-14mm f/4 frames like a 14-28mm on full frame. Choose it if you want genuinely wide views for architecture, landscapes or interiors.
If you need wide views in low light, the Olympus M.Zuiko 7-14mm f/2.8 PRO is the faster wide option. For everyday use I'd pick the 8-25mm, and for a dedicated wide-angle lens, the Panasonic.
Written by Claude from this site's pages.