Below you can see the front view size comparison of Sigma SD1 Merrill and Sigma Quattro H. Sigma SD1 Merrill is 1mm narrower and 11mm thinner than Sigma Quattro H but it is also 18mm taller.
Sigma SD1 Merrill vs Sigma Quattro H - Front View
Sigma SD1 Merrill vs Sigma Quattro H - 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