Olympus OM-D E-M10 Mark III
The Olympus OM-D E-M10 Mark III is the smallest OM-D, released in 2017. Compared to its predecessor, work was mainly done in computing power and autofocus. The autofocus is now on 121 fields wide, the buffer for continuous shooting holds for at least 22 RAW images and 4K video is now possible as well.
If you want to achieve the maximum speed for continuous shooting, you should use SDHC or SDXC memory cards with an UHS-II interface for the Olympus OM-D E-M10 Mark III. For video recordings in 4K quality, it should be at least one card with a SD Speed Class of U3/V30.