Earlier MediaTek Dimensity 9000 benchmarks were run on a prototype machine and showed the MediaTek chipset with a 40%+ efficiency advantage over the Snapdragon 8 Gen 1. The Dimensity 9000 has now debuted on an actual smartphone, though—the OPPO Find X5 Pro—and new benchmarks tell a different story.
https://www.notebookcheck.net/MediaTek-Dimensity-9000-vs-Snapdragon-8-Gen-1-First-mass-production-device-benchmarks-show-less-of-a-gap-than-previously-thought.608051.0.html