Below you can see the front-view size comparison of the Fujifilm Z900EXR and Fujifilm X-E2S. The Fujifilm Z900EXR is clearly the smaller of the two cameras. Its body is 28mm narrower, 16 mm shorter and 19 mm thinner than the Fujifilm X-E2S.
The chart below depicts how two cameras compare with average dimensions of the cameras in their class.