Below you can see the front view size comparison of Nikon Z7 and Fujifilm GFX 50R. Fujifilm GFX 50R is 4mm shorter and 2mm thinner than Nikon Z7 but it is also 27mm wider.
Nikon Z7 vs Fujifilm GFX 50R - Front View
Nikon Z7 vs Fujifilm GFX 50R - 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