Below you can see the front-view size comparison of the Leica SL2 and Leica M-E Typ 220. The Leica M-E Typ 220 is clearly the smaller of the two cameras. Its body is 7 mm narrower, 27 mm shorter and 46 mm thinner than the Leica SL2.
The chart below depicts how two cameras compare with average dimensions of the cameras in their class.