GoPro Hero7 Silver has a
10.0MP 1/2.3-inch (6.17 x 4.55 mm ) sized CMOS sensor . On the other hand, Sony WX9 has a
16.0MP 1/2.3-inch (6.17 x 4.55 mm ) sized BSI-CMOS sensor and features BIONZ processor.
Sony WX9's sensor provides 6MP more than GoPro Hero7 Silver'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 Hero7 Silver and WX9 sensor size comparison.
Sensor Size and Resolution Comparison image of GoPro Hero7 Silver and Sony WX9 Cameras
GoPro Hero7 Silver and Sony WX9 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.
Sensor size sets the circle of confusion, so it drives how much depth of field each
of these bodies gives you at a given aperture. You can calculate it exactly for the
GoPro Hero7 Silver
or the
Sony WX9 ,
including hyperfocal distance.