Below you can see the front view size comparison of Leica SL2 and Canon 90D. Canon 90D is 5mm narrower and 2mm shorter than Leica SL2 but it is also 35mm thicker.
Leica SL2 vs Canon 90D - Front View
Leica SL2 vs Canon 90D - 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