thats an awesome thread Götz! , I’ve been generally surprised with RC quality and speed honestly, I got 15million tris from a Samsung galaxy s7 scan 
something impossible with photoscan. I was wondering because I was considering to get a smaller sensor camera, to have more dof. Thats why I was considering M43 but saw someone here had issues with it . But it seems then that just any camera with low iso and enough megapixels will do a decent job