A YouTuber pitted the MediaTek Dimensity 9000 against the Snapdragon 8 Gen 1 and found that the former easily defeats the latter in CPU tests. On the other hand, the Qualcomm part is slightly ahead of the high-end MediaTek Dimensity SoC.
https://www.notebookcheck.net/MediaTek-Dimensity-9000-engineering-sample-outperforms-the-Snapdragon-8-Gen-1-while-consuming-lesser-power.593546.0.html