Below you can see the front-view size comparison of the Olympus E-PL9 and Fujifilm GFX 50R. The Olympus E-PL9 is clearly the smaller of the two cameras. Its body is 44mm narrower, 29 mm shorter and 27 mm thinner than the Fujifilm GFX 50R.
The chart below depicts how two cameras compare with average dimensions of the cameras in their class.