Below you can see the front-view size comparison of the Canon ELPH 330 HS and Olympus E-PL2. The Canon ELPH 330 HS is clearly the smaller of the two cameras. Its body is 17mm narrower, 16 mm shorter and 19 mm thinner than the Olympus E-PL2.
The chart below depicts how two cameras compare with average dimensions of the cameras in their class.