First photos/video i've been able to find of a G80 in Skyscraper Grey. The detailer stated it was Skyscraper, then reached out to the owner of the car to confirm.
Like I said in the original post, you can tell it is a fairly neutral grey that will take on the color temperature (cool or warm) depending on the environment. In the video you can see it shift as he circles the car.
https://youtu.be/azR8S1I8XEY