Sony A99 II has a
42.0MP Full frame (35.9 x 24 mm ) sized BSI-CMOS sensor and features Bionz X processor. On the other hand, Panasonic S1R has a
47.0MP Full frame (36 x 24 mm ) sized CMOS sensor and features Venus Engine processor.
Panasonic S1R's sensor provides 5MP more than Sony A99 II's sensor, which gives a significant advantage in real life. You can print your images larger or crop more freely.
On the other hand, please keep in mind that Max sensor resolution is not the only determinant of resolving power. Factors such as the optical elements, low pass filter, pixel size and sensor technology also affects the final resolution of the captured image.
Another similarity between these two cameras is that both Panasonic S1R and Sony A99 II sensors lack anti-alias (Low-Pass) filters. Removing anti-alias filter increases the sharpness and level of detail but at the same time, it increases the chance of moiré occurring in certain scenes.
Below you can see the A99 II and S1R sensor size comparison.
Sony A99 II and Panasonic S1R have almost the same sensor size, so neither of them has any significant advantage over the other in terms of providing control over depth of field when used with the same focal length and aperture.
DxOMark Sensor Scores
DxOMark is a benchmark that scientifically assesses image quality of camera sensors. It scores camera sensors for color depth (DXO Portrait), dynamic range (DXO Landscape) and low-light sensitivity (DXO Sports), and also gives them an overall score. Sony A99 II and Panasonic S1R sensors have been tested by DxO and the results show that S1R has a better overall score of 100, 8 points higher compared to A99 II's score of 92.
Model |
Overall |
Color Depth |
Dynamic Range |
Low-light ISO |
Sony A99 II |
92 |
25.4 bits |
13.4 Evs |
2317 ISO |
Panasonic S1R |
100 |
26.4 bits |
14.1 Evs |
3525 ISO |