Below you can see the front view size comparison of Olympus E-PM1 and Nikon 1 AW1. Olympus E-PM1 is clearly the smaller of the two cameras. Its body is 4mm narrower, 8mm shorter and 3mm thinner than Nikon 1 AW1.
Olympus E-PM1 vs Nikon 1 AW1 - Front View
Olympus E-PM1 vs Nikon 1 AW1 - 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