Below you can see the front view size comparison of Canon R and Panasonic G9. Canon R is 1mm narrower and 8mm thinner than Panasonic G9 but it is also 1mm taller.
Canon R vs Panasonic G9 - Front View
Canon R vs Panasonic G9 - 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