I can't give you exact answers, since PC specs vary so much. It should have similar performance. The worse case currently is in the downtown of the new RWG cities, but they are working on a point system to help keep too many high resource POIs from being together.
The game will use around 6 cores, but cores are not used equally because there are many different workloads being run. Many tasks have to be done on the main thread in Unity, which consistently takes the most amount of time per frame. The same with the graphics thread. Beyond that, other threaded tasks like mesh creation, collision mesh baking and AI pathing are on demand as needed. I have a 12 core CPU, but it certainly does not need or use all of those cores. Extra cores are nice to have, since the OS and other programs can run without using cores the game is using.