Below you can see the front view size comparison of Sony RX100 IV and Olympus E-M5 II. Sony RX100 IV is clearly the smaller of the two cameras. Its body is 22mm narrower, 27mm shorter and 4mm thinner than Olympus E-M5 II.
Sony RX100 IV vs Olympus E-M5 II - Front View
Sony RX100 IV vs Olympus E-M5 II - Top View
The chart below depicts how two cameras compare with average dimensions of the cameras in their class.
Camera Size Comparison
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