The 5x periscope is a HUGE upgrade, since it has a bigger sensor paired with bigger pixels when pixel binned that receive a lot more light. At this size, it has a Full Frame Equivalent aperture of f/21, a COMPLETE far-cry from the f/42 equivalent aperture from the 10x zoom camera used by the S21/S22/S23 Ultra.
Sad that the ultrawide and 3x zoom camera were left unchanged, if Samsung would've used these cameras also, it would've made for an extremely consistent camera setup like the Xiaomi 13 Ultra.