Below you can see the front-view size comparison of the Olympus E-M5 II and Olympus E-P5. The Olympus E-P5 is clearly the smaller of the two cameras. Its body is 2 mm narrower, 16 mm shorter and 8 mm thinner than the Olympus E-M5 II.
The chart below depicts how two cameras compare with average dimensions of the cameras in their class.