I just got my Z7 with the FTZ lens adapter. Love it so far. It will be a great companion to my D850.
My only complaint is: I find the Mode selector dial a little clumsy to use. You have to hold down the little button in the middle of the dial before you can turn it to the desired mode. It's awkward to select a mode using one hand.
I have a Sony point-n-shoot that has a similar mode dial. It doesn't have a centre button. You simply turn the dial with your thumb. The dial has a definite detent for each selection which locks the dial in place. Much easier to use. Maybe in the next version of Z.