rdonson
Premium Pilot
I'm not demeaning the smaller sensors as each has their place, but as sensors increase in size so does the usefulness of the images generated.
Phase detection is indeed a very nice feature, one that is often obtained with a full frame or one of the better APS-C/H cameras. But that stuff costs more, which is the area many consumer drone buyers balk.
Sensor size has some diminishing factors. The more pixels you put on a specific size sensor even 35mm sensors the smaller the pixels are. Smaller pixels don't gather as much light as larger pixels. So.... you mention 42 mega pixels but imagine someone packing 100 megapixels on the same size sensor. Less light means more noise. Its just physics.
Most mirrorless cameras these days do have phase detection AF. From 1" sensors cameras up to the medium format cameras.
DSLRs are becoming dinosaurs. The flip up mirror has become an anachronism. Even Canon and Nikon finally offer mirrorless cameras although Sony is eating their lunches. The latest Sony A7R IV is a marvel. Sony a7R IV: Digital Photography Review
For shooting sports the Sony A9 is an absolute leader of the pack in many ways.
No, I don't own Sony cameras and my Canon DSLRs sit on a shelf gathering dust. I love my Fuji APS-C cameras. If money were no object I'd probably also own the Fuji GFX 100 - 100 megapixel medium format mirrorless. No I'd never put that on a drone....waaaay too much money in the camera not to mention the cost of lenses.
FWIW I can easily print 17"x25" photos from my 24 megapixel Fuji APS-C camera. 4K video is still 4K video resolution so that's not much of a challenge for most cameras make in the last 4 years or so.