Panasonic G1 has a
12.0MP Four Thirds (17.3 x 13 mm ) sized CMOS sensor . On the other hand, Sony A9 has a
24.0MP Full frame (35.6 x 23.8 mm ) sized Stacked BSI-CMOS sensor and features BIONZ X processor.
Sony A9's sensor provides 12MP more than Panasonic G1'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.
Below you can see the G1 and A9 sensor size comparison.
As seen above, Sony A9 has a 3.8x Larger sensor area than Panasonic G1. Larger sensors give photographer more control on the depth of field and blurry background compared to smaller sensor when shot in 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. Panasonic G1 and Sony A9 sensors have been tested by DxO and the results show that A9 has a better overall score of 92, 39 points higher compared to G1's score of 53.
Model |
Overall |
Color Depth |
Dynamic Range |
Low-light ISO |
Panasonic G1 |
53 |
21.1 bits |
10.3 Evs |
463 ISO |
Sony A9 |
92 |
24.9 bits |
13.3 Evs |
3517 ISO |