Below you can see the front view size comparison of Pentax WG-10 and Olympus E-M5 II. Pentax WG-10 is clearly the smaller of the two cameras. Its body is 8mm narrower, 26mm shorter and 16mm thinner than Olympus E-M5 II.
Pentax WG-10 vs Olympus E-M5 II - Front View
Pentax WG-10 vs Olympus E-M5 II - 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