The pixels in the
M3 are twice the size of the M2 pixels. This allows twice as many photons to land on a pixel, yielding better dynamic range and low light performance.
Think of a camera sensor as a telescope (my other hobby is astrophotography) the bigger the scope the more photons enter. A 10” scope will perform much better and faster then a 5” scope because more light is hitting the sensor. But in the case of a drone the aperture size doesn’t change, you’ve increased the surface area of the sensor. This allows more detail in the image, doesn’t make the camera faster.
This is pretty hard to explain especially on a Friday night. If you have a two inch sensor it’s surface area is receiving and recording more photons per second, rendering more detail in any given image under any given conditions as the speed of light is constant. This is why you can blow up a 2 inch sensors image on a big screen and still see excellent results.