Below you can see the front-view size comparison of the Fujifilm X100F and Olympus E-M1 II. The Fujifilm X100F is clearly the smaller of the two cameras. Its body is 7mm narrower, 16 mm shorter and 15 mm thinner than the Olympus E-M1 II.
The chart below depicts how two cameras compare with average dimensions of the cameras in their class.