Panasonic GX7 has a
16.0MP Four Thirds (17.3 x 13 mm ) sized CMOS sensor and features Venus Engine processor. On the other hand, Canon 77D has a
24.0MP APS-C (22.3 x 14.9 mm ) sized CMOS sensor and features DIGIC 7 processor.
Canon 77D's sensor provides 8MP more than Panasonic GX7'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 GX7 and 77D sensor size comparison.
As seen above, Canon 77D has a 1.5x Larger sensor area than Panasonic GX7. 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 GX7 and Canon 77D sensors have been tested by DxO and the results show that 77D has a better overall score of 78, 8 points higher compared to GX7's score of 70.
Model |
Overall |
Color Depth |
Dynamic Range |
Low-light ISO |
Panasonic GX7 |
70 |
22.6 bits |
12.2 Evs |
718 ISO |
Canon 77D |
78 |
23.6 bits |
13.3 Evs |
971 ISO |