Since this thread seems to be running around in circles now (the A1 users repeating -- and repeating -- how much they like the lighter weight and others pointing out other features they like about the Z9, what I get out of all this is that to me the decision A1 vs Z9 probably really comes down to camera feel/ergonomics. Both cameras clearly have basically fabulous mirrorless features and the differences in the specs exist but -- to me -- they are really not that material, and nothing to get all in a huff about. You can take superb photos with either. Unless you truly have some specific need, such as 8K video at 120 fps (or something else), either will do the trick. Last year, I faced the decision of whether to switch from Nikon or not. I got an R5 and then an A1 and tried them each for a week. (Didn't try an R3 but I doubt it would have changed my mind). They certainly were specification-wise and feature-set-wise fabulous. But rather than switching, I stuck with waiting for the Z9 because, all in all, I simply didn't like the way either felt in my hand. My primary camera has been an D850, sometimes with a grip for sports, and I simply love the way it feels. That to me ended up being the paramount factor. I did, for temporary purposes, get a Z6ii which works just fine for family shots (and gave me a reason to start getting Z glass) and, with a SmallRig cage, it feels good. But I, for one, am glad that the Z9 probably will feel similar to the D850 and will make my decision to stick with Nikon worthwhile. So, as to the OP, I would think the best thing do to is to hang loose and then compare how each camera feels to you in your hand and for your shooting purposes. Either will give you great photos (And, BTW, it seems clear that the new Nikon primes, at least, are going to be PF, to the extent that matters to you.)