As you said: You think! You cannot know. As if R5 is not good enough.Even the AF of the A9I is better then this one of the R5. So... the AF of the A1 will be insane I think.
Also NO blackouts! 240Hz EVF with ~80% more resolution!!
Also EVFs do not take the picture. Their resolution is irrelevant.
NO blackouts are useful. But i didn't notice anything annoying with the R5 EVF at 120Hz.