Below you can see the front-view size comparison of the Olympus E-M5 II and Fujifilm X-T1 IR. The Olympus E-M5 II is clearly the smaller of the two cameras. Its body is 5mm narrower, 5 mm shorter and 2 mm thinner than the Fujifilm X-T1 IR.
The chart below depicts how two cameras compare with average dimensions of the cameras in their class.