The Samsung Galaxy S21 Ultra ships with an Exynos 2100 SoC in Europe and other regions, but with the Snapdragon 888 in China and North America. While the two SoCs are more or less even in terms of performance, DxOMark has shown that the Exynos 2100 model delivers worse image quality.
https://www.notebookcheck.net/The-Samsung-Galaxy-S21-Ultra-with-a-Snapdragon-SoC-takes-better-photos-than-the-Exynos-model.532753.0.html