You asked
Olympus om d e m10 mark iii vs panasonic lumix gx850?
Both are 2017 Micro Four Thirds bodies with about 16 megapixels, so the sensor won't separate them. The difference is what surrounds it. The Olympus OM-D E-M10 Mark III has five-axis stabilisation in the body and 4K video, which I'd want for handheld shooting or film. The Panasonic Lumix GX850 is tinier and has a selfie screen, but no viewfinder and no in-body stabilisation, so you'll need stabilised lenses for slow shutter speeds.
With either body, I'd look at:
- Olympus M.Zuiko 25mm f/1.8 for everyday portraits and general shooting
- OM System M.Zuiko 100-400mm f/5-6.3 IS II if wildlife or sport is the goal
My pick is the E-M10 Mark III, unless small size matters more to you than stabilisation. For more on the format, see Micro Four Thirds.
Written by Claude from this site's pages.