The latest potential Samsung Galaxy S21 Geekbench 5 scores are out there, and they show the Snapdragon 875 variant may be ahead of what might be this phone's Exynos 2100-powered counterpart. However, according to a famous leaker, this is not the whole story.
https://www.notebookcheck.net/The-Exynos-2100-is-now-alleged-to-have-a-top-speed-beating-that-of-the-Snapdragon-875.505064.0.html