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Yes.

I had trouble using a 24Mpixel A9 II for BiF. I replaced it with an A1 which I found easier to use, mainly because I didn't have to try as hard to fill the frame with the subject.

Now I have the A9 III, and the 24Mpixel isn't as much of a problem, which is not something I expected!

I think there are a couple of technical reasons:

• the A9 II had a rather strong AA filter; it seems the A9 III has no AA filter at all. So the image is sharper.
• the A9 III EVF is much more detailed (9Mdot vs 3.7Mdot) and seems to respond faster

I'm probably a bit better at shooting with 24Mpixel, too.

Oh, and the better AF means that whatever you are aiming at is more likely to be in sharp focus (and it can focus on subjects that are smaller in frame).

All up, I think 24Mpixel is more usable on the A9 III than it was on the A9 II.