Below you can see the front view size comparison of Fujifilm X-T1 and Fujifilm X-T2. Fujifilm X-T1 is clearly the smaller of the two cameras. Its body is 4mm narrower, 2mm shorter and 2mm thinner than Fujifilm X-T2.
Fujifilm X-T1 vs Fujifilm X-T2 - Front View
Fujifilm X-T1 vs Fujifilm X-T2 - Top View
The chart below depicts how two cameras compare with average dimensions of the cameras in their class.
Camera Size Comparison
Select Two Cameras for Size Comparison