Below you can see the front-view size comparison of the Ricoh GXR S10 24-72mm and Nikon D3500. The Ricoh GXR S10 24-72mm is clearly the smaller of the two cameras. Its body is 10mm narrower, 27 mm shorter and 26 mm thinner than the Nikon D3500.
The chart below depicts how two cameras compare with average dimensions of the cameras in their class.