Or how the Sony A9-3 is going to affect the successor to the EOS-3 R3 and how soon.
It's funny Craig and I were batting around things Canon could do for the R1 a few months ago, and I was pro-global shutter as what Canon needed to do. I think the A9 III seals the deal on that.
Over the last 5+ years I've written about .. dozens? maybe more? of patent applications that Canon has filed on global shutters. it's certainly something they have been researching for a very very long time.
Outside of that, what the R1 will have that the A9 III doesn't? well, easy.. it's not a Sony. But really the claim on the A9III is that sensor, what else would Canon have to worry about?
The A9III also has a base ISO of 250 so not sure what the DR would be for the A9III. AF with EV - 5.0EV is pretty pedestrian (even if it's at a F1.8 so EV -6 for 1.2). whereas even Canon's older generation sensor in the R3 is sitting at EV -7.5. Video at 4K120p, R3 already does that. No in camera RAW video output. Doesn't seem that you can shoot 6k on it either. R3 already shoots at a max of 195 fps (granted AE/AF locked). DOn't get me wrong, it's looking like a beast of a camera, but Canon's certainly in the position where they can 1, or even 2 up Sony before it's even shipping.