I've had the Nikon Z7 since September 2018 and although I also had the D850 it just gathered dust. I'd gone down the Sony Mirrorless route with the A7R, A7RII and A7RIII and while I love the mirrorless concept and liked them a lot the build quality and ergonomics just weren't up to Nikon standards in my opinion. I'll say it again "in my opinion". OK. When the Z6 and Z7 were released I ditched all my Sony gear and as I could use my existing Nikon lenses it was a literally a weight off my back not carrying two sets of gear around. The Youtube influencers who claim to be impartial "reviewers" panned the Nikon Mirrorless. Don't tell me these sort of people don't get kickbacks from the opposition because you'll never convince me otherwise. In a lot of cases this lot haven't a clue how to get the best out of this new breed of camera. They're different, coming from a long line of Nikon DSLR's thru the D70, D70s, D200, D300, D3, D500, D800, D810 and D850 it did take me a while to figure out how to get what I wanted out them them, I'm still learning. There have been several really excellent firmware updates which have made them even better. One of the firmware updates added the ability to focus on Human and Animal eyes, it was so so and as I rarely photograph people I never used it, a subsequent update improved it even more. I just got a new Z6II which has double the processing power and I thought I'd try the Animal Eye Detection on my herd of cats. I know cats are not often welcome on a bird forum but mine are all out of the yard having been dumped at the farm I think, they never go out, I've had upwards of 80 cats fixed over the years to prevent them breeding and eating my birds and critters. Anyway I tried the eye detection on them and it's awesome, it just locks on to their eye. They are working on improving it to include bird eye detection which will be a great help in bird photography.