Here is a quick comparison for the Olympus E-M10III vs E-M10II vs E-M5II mirrorless cameras with Micro Four Thirds image sensors.

The new Olympus OM-D E-M10 Mark III is quite similar to its predecessor, but despite inheriting many of the same features, it is capable of recording 4K videos.

The E-M10III’s body has seen a slight redesign over its E-M10II predecessor’s and some controls have been re-arranged too. the E-M10 III is almost exactly the same size, and only 10 grams heavier than its predecessor.

The Olympus E-M10 Mark III has a 16.1-megapixel Four Thirds CMOS sensor powered by a dual quad-core TruePic VIII Processor. This is the same processor used in the E-M1 Mark II. There’s 4K video recording and the continuous shooting goes up to 8.6 frames per second.
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https://www.dailycameranews.com/2017/09/olympus-e-m10iii-vs-e-m10ii-vs-e-m5ii/