The problem with determining performance in the game is the location the benchmark was taken from.
With the game's crazy crowd system, and its density depending on time of day and location, along with essentially how random the numbers and NPCs clothing and other gizmos on them can be when they're generated... it creates a lot of variations from one performance 'result' to another. My own "reference point" for my own benchmarks to check my performance is either staying inside my apartment, or going down at the first level of my Megabuilding facing the street intersection there just after going down the last stairs (essentially just about to leave the building, looking outside). I stand there and check my frame rate that way. When I do it inside my apartment that's where I get the highest results (albeit it's not that much higher than outside of it).
Inside the apartment, looking towards the city from the window I get around 32 to 34 FPS tops (literally 34 is the highest I've seen so far for me), it varies very little and sticks around that range of frame rate. But down at the intersection it varies a lot depending on time of day (or night / dawn, etc), and how dense the crowd is. I observed minimum frames going from 26 to 30 FPS, and maximum going from 30 to 33 FPS. My overall average though, remains just right smack on 30 FPS for most locations, at most times of day, even during intense gunfights. I set everything on High, except Local Shadows on Medium (nothing is on Ultra), Motion Blur and Film Grain disabled, but the rest is enabled, and the crowd density option is also set to High. And that's at 1440p, not 1080p (which I haven't even tried yet and I don't think I will either). I'm fine at 30 FPS I'm sort of getting used to it by now.
But I do plan to get a 3080 whenever they're actually available on a regular basis for most consumers out there. But, frankly, I'm really glad I can squeeze 1440p + High settings on a non-Ti GTX 1080.