Full spec comparison here at BHphoto
The Nikon Z9 is seriously challenging the A1. It’s cheaper and in some aspects it beats the A1 performance. If you hope Sony will release a new A1 in 2022 well, forget it. The A1 won’t be replaced at least before end 2023. But the camera will get some major firmware updates and possibly a new price drop too. So please let Sony know what you want to be seen on a future A1 fw update by commenting this post!
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P.S.: Here is Marc Galers video on the latest 1.3 firmware update: