You asked
Panasonic lumix gm1 vs olympus pen e p5?
The two cameras share a sensor. Both use a 16 megapixel Micro Four Thirds chip, and both were announced in 2013, so the difference comes down to body and handling.
The Panasonic Lumix GM1 is the pocketable one, but it has no viewfinder and no stabilisation in the body. Pair it with a stabilised lens if you shoot at slow shutter speeds. The Olympus PEN E-P5 has a metal body and five-axis stabilisation, and its viewfinder is an optional clip-on. For most people, I'd pick the E-P5 for its stabilisation and flexibility.
If you go with the GM1, keep it light and simple with a small prime such as the Panasonic Lumix G 14mm f/2.5 II or the Panasonic Lumix G 20mm f/1.7 II. On the E-P5, the Olympus M.Zuiko 17mm f/1.8 is a good everyday pick.
Written by Claude from this site's pages.