When comparing Panasonic Lumix G7 vs Olympus OM-D E-M10 Mark IV, the Slant community recommends Olympus OM-D E-M10 Mark IV for most people. In the question“What are the best mirrorless cameras under $1,000?” Olympus OM-D E-M10 Mark IV is ranked 16th while Panasonic Lumix G7 is ranked 19th. The most important reason people chose Olympus OM-D E-M10 Mark IV is:
The memory card slot supports high-speed UHS-II cards.
Specs
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Pros
Pro MFT lens mount allows for a wide variety of lenses to choose from
Micro Four Thirds system is a standard used by Panasonic, Olympus, Sigma and many others so you're not locked into a having to buy lenses from one manufacturer.
Pro Shoots good quality 4K@30 video
The G7 takes footage from a crop of the sensor and includes focus peaking and zebra striping tools allowing you to get good quality video.
Pro UHS-II card support
The memory card slot supports high-speed UHS-II cards.
Pro Slim, retro style
Pro 4K video
Can shoot 4K at 30 fps, with a recording limit of 29 minutes.
Pro Built-in flash
Cons
Con Can't zoom in on video in playback mode
There's no way to zoom in on the screen in playback mode to check details of the footage.
Con Complex menus
Camera body is a bit cluttered with controls and the menu system is overly complex.