You asked
Olympus pen e p7 vs olympus om d e m10 mark iv?
Both cameras use the same 20.3-megapixel Micro Four Thirds sensor, so image quality should be very similar. They differ mainly in how they feel to use.
The Olympus PEN E-P7 is the stylish one: a small rangefinder-style body with no viewfinder and a colour/monochrome switch. The Olympus OM-D E-M10 Mark IV is the practical pick. It's tiny, has in-body stabilisation, and is cheap, especially used, which makes it a great first camera.
Because they share a mount, any Micro Four Thirds lens fits either body. If you want a camera you'll mainly use for everyday shooting, I'd go with the E-M10 Mark IV.
Written by Claude from this site's pages.