Canon doesn't do it better. I tried the R5 mode a few times when it came out and it's complete garbage. More like something an intern did as a proof of concept than an actual well implemented feature. The stitching could be done a lot better, but it isn't. Purely a marketing gimmick.
The new R5 Mk II AI upscale is the same, a gimmick that got way to much attention by the press solely for using the word AI.
Canon does use AI features in their R5 AF tracking, and it's really impressive. But Canon calls those features deep learning or other more specific terms.
A7III has a dedicated DSP for focus & tracking, plus it has a computer vision model which can detect eyes and focus for them (even when you have sunglasses it can spot eyes perfectly), moreover you can give 5 faces to it with focus priority, and if it finds any of these faces in the frame, it focus to that one (lower the number, higher the priority). System works at 30 calculations per second, correcting focus 30 times per sec, as required.
This is Sony's AF system, 2 generations ago. I'm sure big three can do these tricks, at least at 30FPS. Latest, highest end Sony cameras do it at 120FPS, plus it can track whole body after losing the face, so they can track the same person in the frame after latching to it.
The new R5 Mk II AI upscale is the same, a gimmick that got way to much attention by the press solely for using the word AI.
Canon does use AI features in their R5 AF tracking, and it's really impressive. But Canon calls those features deep learning or other more specific terms.