My relationship with the D810 is becoming pretty solid, starting to resemble what I felt about the OM-1, a camera that I used for 30 years. I'm even back to manual focus lenses for most of my photography, at least up to 105mm, and will spend the next few months refining my 20/28/50/105mm combo, replacing the 20 and the 50, which are the weakest links.
So, I stumbled across the excellent quotation below. GAS isn't something that came with digital. It's always been there. And even if I try to convince myself that GAS is gone in my case, it has just changed name. Now, it's called Otus GAS and Zeiss GAS
"The fact is that relatively few photographers ever master their medium. Instead they allow the medium to master them and go on an endless squirrel cage chase from new lens to new paper to new developer to new gadget, never staying with one piece of equipment long enough to learn its full capacities, becoming lost in a maze of technical information that is of little or no use since they donít know what to do with it."
- Edward Weston, 1927