MJPerini wrote:
I agree with @bill Nikon If you buy the camera and the adapter , you can take your time and test your lenses.
You can always decide to spend more money.
The The D500 is a very good camera, I would be surprised if you really Needed the Z8 for better focusing.
You have a lot of 'all in one' type lenses, Have you ever tried a faster pro grade lens, I'll bet any focusing /sharpness issues would go away.
If you just Want a Z8, that is a fine camera too.