Manufacturers should really stop using the archaic pick-up tube -format for describing sensor sizes in any modern camera system. The 12S Ultra's sensor is the largest ever used in a smartphone yet it's nowhere near one inch in any direction, not even diagonally.

It's a bit of a shame that this phone probably won't see an international release.

Argh！It's not a "1-inch" sensor, much less a "1-inch camera"!! There's no such thing as a "1-inch camera"! The Type-1" sensor format is about 2/3" in measured diagonal! True, Xiaomi attempts to portray it otherwise, it's a blatant lie!
This is some truly amateur reportage.