Nikon D850 Autofocus in low light compared to D4 or D5?

Is there anybody who has (or used to have) both the new Nikon D850 AND D3 or D4 or D5?

I am just wondering how similar the Autofocus in LOW LIGHT in the D850 compared to one of the Nikon D3, 4, 5 flagship cameras. Is AF same; accurate and fast for low light action, wedding reception dancing, etc?

Thanks so much!

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