Below you can see the front-view size comparison of the Olympus E-PL9 and Fujifilm X-T10. The Olympus E-PL9 is clearly the smaller of the two cameras. Its body is 1mm narrower, 15 mm shorter and 2 mm thinner than the Fujifilm X-T10.
The chart below depicts how two cameras compare with average dimensions of the cameras in their class.