Below you can see the front-view size comparison of the Nikon 1 J3 and Leica M-E Typ 220. The Nikon 1 J3 is clearly the smaller of the two cameras. Its body is 38mm narrower, 19 mm shorter and 8 mm thinner than the Leica M-E Typ 220.
The chart below depicts how two cameras compare with average dimensions of the cameras in their class.