I just received my new Mavic 3 and below are some test images using the 1X and 7X cameras. I've been quite impressed, and anecdotally appears to be a big improvement over my old Mavic 2 Pro. The night and dusk shots with the Hasselblad camera are very clean. These images were processed in Lightroom using the DNG raw files. Check out the captions for each image. I will be adding more in-depth image comparisons and video footage so please check back in.
Hasselblad Camera (1X) samples image

f2.8 1/20 ISO 100 HDR PANO

f2.8 0.6 sec ISO 100

f3.5 2.0 sec ISO 100

f2.8 1/4000 ISO 100

f2.8 1/1600 ISO 100

Straight out of the camera JPEG

1X Camera this is only in the middle of the frame
The image quality from the tele camera is comparable to a smartphone from a few years ago. While it's not great, this camera can take shots that are not possibe with other cameras that do not fly. It unlocks new possibilities which I'm looking forward to. This camera only shoots JPEG at the moment. Focusing this camera in low light is quite tricky.
Tele Camera (7X) samples images

f4.4 1/120 ISO 100

f4.4 1/5 ISO 2310

f4.4 1/5 ISO 2310

f4.4 1/800 ISO 100
Straight out of camera JPEG

7X Camera