Below you can see the front view size comparison of Olympus E-M10 and Sony A6000. Sony A6000 is 15mm shorter and 1mm thinner than Olympus E-M10 but it is also 1mm wider.
Olympus E-M10 vs Sony A6000 - Front View
Olympus E-M10 vs Sony A6000 - Top View
The chart below depicts how two cameras compare with average dimensions of the cameras in their class.
Camera Size Comparison
Select Two Cameras for Size Comparison