Below you can see the front view size comparison of Sigma DP2 Quattro and Sigma DP3 Merrill.
Sigma DP2 Quattro vs Sigma DP3 Merrill - Front View
Sigma DP2 Quattro vs Sigma DP3 Merrill - 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