CineBench benchmarks show the quad-core Core i7-8706G to be just 9 percent behind the Core i5-8300H in the latest XPS 15 9570. This processor is currently not available on any mass market consumer laptop and can only be found on the Precision 5530 2-in-1 workstation for now.
https://www.notebookcheck.net/Rare-Intel-Core-i7-8706G-Kaby-Lake-G-processor-is-almost-as-fast-as-the-Core-i5-8300H.338748.0.html