Below you can see the front view size comparison of Pentax K-1 and Olympus E-M1 II. Olympus E-M1 II is clearly the smaller of the two cameras. Its body is 3mm narrower, 19mm shorter and 19mm thinner than Pentax K-1.
Pentax K-1 vs Olympus E-M1 II - Front View
Pentax K-1 vs Olympus E-M1 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