Below you can see the front-view size comparison of the Olympus E-M10 II and Fujifilm GFX 50R. The Olympus E-M10 II is clearly the smaller of the two cameras. Its body is 41mm narrower, 14 mm shorter and 19 mm thinner than the Fujifilm GFX 50R.
The chart below depicts how two cameras compare with average dimensions of the cameras in their class.