Body & Design
At first glance, the E-M10 is a veritable doppelgänger for its older, higher-tier sibling, the E-M5. Despite this, there aren't huge differences in the apparent build quality of the two cameras. The E-M10's dials feel a little less substantial than the E-M5's - both in terms of the materials used and the ease with which they're operated. Beyond that, the body has a similarly dense and solid feel to it.
The camera's ports (a micro-HDMI socket and combined USB/AV output) move to the right flank, where they're covered by a distinctly flimsy-feeling rubber door. These aren't ports we use a lot, and we've not heard of many E-M5 owners decrying the similarly disappointing example on their camera.
In your hand
|Olympus E-M5||Fujifilm X-M1||Nikon D5300|
As you can see, the E-M10 is a small camera by any sensible measure. Olympus points out that, with the 14-42mm F3.5-5.6 EZ ED MSC power zoom launched alongside the camera, the E-M10 and lens are slimmer than Canon's 'Smallest, lightest DSLR in the World,' the EOS SL1/100D. Despite this, the E-M10 finds room to fit the level of direct control you would expect of a camera several price levels higher.
LCD and Viewfinder
The E-M10 offers the same viewfinder as offered in the E-M5 - a 1.44m dot LCD panel that provides an 800x600 pixel view of the world. It's not in the same league, either in terms of size or resolution, as the finder in the company's flagship E-M1, though.
Meanwhile the rear screen improves on the VGA-equivalent OLED display that featured on the E-M5 - instead the E-M10 gets a 720 x 480 pixel (1.04m dot) LCD. It's still a tilting, touch-sensitive panel, but it's a little more detailed and a bit nicer to use in bright light.
This diagram should make it clear how comparatively large the E-M10's viewfinder is - the Pentax K-50 is one of the few cameras in this class to offer a larger finder. The E-M10 has two viewfinder modes, and this illustrates the largest view it offers. A second mode separates the shooting info, with a smaller preview as a trade-off.