An extensive comparison video has shown what to expect from the upcoming Intel Core i9-11900K on a Z590 motherboard. The Rocket Lake processor was benchmarked against AMD's Ryzen 7 5800X and Ryzen 7 5700G, which are also eight-core processors. Intel has an edge in synthetic benchmarks, but AMD reigns supreme in gaming benchmarks.
https://www.notebookcheck.net/The-Intel-Core-i9-11900K-loses-gaming-performance-comparison-against-the-AMD-Ryzen-7-5800X-and-Ryzen-7-5700G.519892.0.html