I, too, have picked up some extraordinary bargains on the used market, thanks to fickle, amateur, photographs and other so-called "early adopters" with more money then actual need or talent. Look, I'm not knocking them. It's a food-chain and some animals are sloppy eaters leaving plenty behind, for scavengers such as I. Truth be known, I'd rather buy new, what I want, when I want it, then wait for some rich, New Jersey dentist to get bored with last year's toys. But when I can, or must, wait I do - and patiently, unless a work-load necessitates otherwise. (I'm a school boy again and botany labs make upping my macro/micro skills a decided advantage.) Incredible as it is, even to my own sensibilities, I think I'd opt for a used Z8 at this juncture over a similarly priced, used, D850. And I know, too, part of my rationale is predicated on not wanting to be left behind, in some sense. (Or so says the boy cuddling his Nikon F and lamenting the parade passing him by no matter how fast he runs.) All said, there's a lot of Z-stuff being unloaded and a Z5 would suit me fine... but I wouldn't pass on a Z50 to mount on my microscope or some legacy pancake lens.