1. Can Autofocus Full Frame M camera
2. U have better workflow and speed using M lens on it because EVF so big so easy and taste to nail focus
3. Wifi and GPS finally!
4. ISO performance in between A7R II and A7S II
5. R Lens on it even better!!!
6. Best EVF ever
7. Fastest Leica camera I use, I have M, Q and SL
8. Great control customization and layout