I have passed on the Nikon Z cameras, waiting for the 'flagship' model. With my many DSLR I could not reason a purchase of anything less than the top of the heap.
Many have had concerns about long waiting time for this camera. I ordered mine 4-26-22 and received it on 4-28-22, at this writing owning it 45 days or so.
Bottom line for me: Lots to learn, and an amazing camera. This is not as constructed, in my opinion, as the D6, But it is an amazing tool. I believe it is a video camera that makes superior still photos.
I made a few jpg photos with the Z9 and D6 - they looked identical.
The soccer photos was my 2nd day of using this Z9, my grandson is mostly in the photos. Nailed the photos - 70-200 2.8 lens on soccer, Egret was mostly 200-500 and some 500PF. Squirrel was 500PF with 14X