Both Sony RX100 II and Sony RX100 III have 20.0 MP resolution sensors but Sony RX100 II's sensor is 1-inch (13.2 x 8.8 mm ) and Sony RX100 III's sensor is 1″ (13.2 x 8.8 mm ).
Since Sony RX100 III's has a larger sensor area with the same resolution, this means that it also has a larger pixel area hence better light collecting capacity for a given aperture compared to Sony RX100 II.
Below you can see the RX100 II and RX100 III sensor size comparison.
Sony RX100 II and Sony RX100 III have the same sensor sizes so they will provide same level of control over the depth of field when used with same focal length and aperture.
DxOMark Sensor Scores
At Camera Decision, we also look at Dxo Mark sensors when available as we think it is a good indicator of image quality.
Model |
Overall |
Color Depth |
Dynamic Range |
Low-light ISO |
Sony RX100 II |
67 |
22.5 bits |
12.4 Evs |
483 ISO |
Sony RX100 III |
67 |
22.4 bits |
12.3 Evs |
495 ISO |