The AMD Ryzen 7 5750G has appeared online and overclocked to 4.8 GHz. The Cezanne APU comes within a whisker of the Ryzen 7 5800X in CPU-Z and outscores the Core i9-10900K on single-core performance. The Comet Lake-S has the edge in CPU-Z multi-core thanks to its two additional cores, though.
https://www.notebookcheck.net/AMD-Ryzen-7-PRO-5750G-overclocked-to-4-8-GHz-matches-the-Ryzen-7-5800X-and-outperforms-the-Intel-Core-i9-10900K-in-CPU-Z.521674.0.html