Below you can see the front-view size comparison of the Fujifilm GFX 50R and Leica M Edition 60. The Leica M Edition 60 is clearly the smaller of the two cameras. Its body is 22 mm narrower, 17 mm shorter and 24 mm thinner than the Fujifilm GFX 50R.
The chart below depicts how two cameras compare with average dimensions of the cameras in their class.