Getting an idea for comparable performance... LET'S COMPARE NOTES!
I'll post my numbers and hopefully some of you will post yours and we can see what are good expectations: (On Windows 10 and Windows Server 2k19).
Doom 2016: 4K, Ultra, 100 fps
Doom Eternal: 4K, Ultra Nightmare, 60 fps (vsynced)
Division 2: 4K, High, 55 fps
Metro Exodus: 4K, High, 60 fps
Resident Evil 3: 4K, Ultra, 60 fps
State of Decay 2: 4K, High, 45 fps
Gears of War 5: 1440p, High, 40 fps
Forza Horizon 4: 4K, Ultra, 60 fps
Hunt: 4K, High, 45 fps
Apex Legends: 1440p, High, 60 fps
I'd be willing to add more entries. I'd also be willing to compile results in an xls so we could see what kind of settings, engines and the like operate best on egpus.