Below you can see the front view size comparison of Canon M6 and Fujifilm GFX 50S. Canon M6 is clearly the smaller of the two cameras. Its body is 36mm narrower, 47mm shorter and 46mm thinner than Fujifilm GFX 50S.
Canon M6 vs Fujifilm GFX 50S - Front View
Canon M6 vs Fujifilm GFX 50S - 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