Below you can see the front-view size comparison of the Ricoh GXR S10 24-72mm and Sony A37. The Ricoh GXR S10 24-72mm is clearly the smaller of the two cameras. Its body is 10mm narrower, 22 mm shorter and 41 mm thinner than the Sony A37.
The chart below depicts how two cameras compare with average dimensions of the cameras in their class.