Below you can see the front-view size comparison of the Fujifilm X-T10 and Olympus E-M5 II. The Fujifilm X-T10 is clearly the smaller of the two cameras. Its body is 6mm narrower, 2 mm shorter and 4 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.