Shot some real-world comparisons in bright sun today with the A9 and the A7SII.

Sony A9 vs. Sony A7SII Real World 4k Video Comparison - YouTube

Neither camera showed signs of overheating.

Moving subject:

A7SII vs. A9 Moving Subject 4k Video Tests (feat. Sony FS7) - YouTube

Autofocus test with face detection

https://youtu.be/A2S7ldU6ip8

Worked with a wedding photographer over the weekend who transitioned to one from Canon. Said he loved it. Did one or two carrying both but now he's all in on the A9. He was highly impressed. Tough sell considering its an investment in both body & lenses but he didn't look back.

Was mostly impressed by it's sharp & quick focus. Granted it seems more of a still photography dedicated camera but good feedback on it nonetheless.