The E-M1 and E-M5 series have always been synonymous with innovation. One introduced the first 5-axis stabilisation system, while the other brought phase detection AF. Later on, they gave us High Res Shot modes and super fast continuous shooting speeds.

The E-M5 III is the third generation E-M5 model and the first not to introduce anything new. Rather it serves up a number of important updates that make the series more competitive in the ever evolving mirrorless market.
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https://mirrorlesscomparison.com/preview/olympus-omd-em5-iii-vs-omd-em1-ii/