there are some minor details not stated here.
The A7m2 had a bit slower AF than the A7Rm2, and the A7m3 being only 2x faster, not sure that it'll be as fast as the A7Rm3. It could be subtle, I'm not sure.
Better AF coverage, I am dissapointed in the R3 now (I kid)
On paper, it seems stupidly similar to the R3 minus megapixels
Good move on sony, Touch screen, Joystick, Z, dual cards, 693 AF points look like they will be standard going forward.
I was gonna say the reports say mini a9 but it looks like an a7r3 minus only the pixels
am I wrong?