Be aware that learning a new camera these days means:
1. Reading and watching many "how-to's"
2. Time to learn your new instrument and use it well. (at least a month of daily use)
3. Upgrades, upgrades, upgrades....
A. Software to the camera, flash, controllers, etc.
B. You're gonna want a bigger and better monitor
C. You're likely to need a faster and better appointed graphics card
D. Your computer may need a complete upgrade, but consider memory and SSD first
Consider editing software that can efficiently manage it all, could be a $300/ yr. upgrade
What? No SSD? That's one of a few bottlenecks...
Video at 8K
to me means minimum of 32GB of fast memory, USB 3.2 support, 1TB of m.2 SSD (or faster) and about 10TB of magnetic storage (HDD).
So a higher-end Mac M2 set up or better, or if Winders, see above specs and start with at least a gen 12 Intel chipset and the fastest processor that you can muster.
You can work in a lesser environment, but it gets tedious.
About cameras, my "if I win the lottery" rig:
https://www.blackmagicdesign.com/products/blackmagicursaminipro