When comparing Canon EOS 70D 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 cameras for photography under $1000?” Olympus OM-D E-M10 Mark IV is ranked 3rd while Canon EOS 70D 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 Good camera for sports/action
The camera has a reasonably quick and reliable autofocusing system within the price range making it a good option for shooting fast-moving subjects.
Pro Reasonable high-ISO performance
Shots up to 6400 ISO are good and even above that threshold sometimes usable.
Pro In-camera RAW processing
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Con Superseded by its successor
This camera's successor, Canon EOS 80D, was released in 2016. While it's currently $200 more expensive and thus beyond the scope of this question, it is a better camera in every other way.
Con Complex menus
Camera body is a bit cluttered with controls and the menu system is overly complex.
Con No add-on microphone support
