Mishaal announced that Android on ASUS Zenfone 9 takes up 22GB of space. Users reported that the operating system takes up more than 70GB of space on the new Samsung Galaxy S23 Ultra. In the 512 GB variant of the smartphone, this is 13% of the total. For example, someone listed 41GB on the Galaxy Z Fold 4 and 50GB on the Galaxy Z Flip 3.
As for the Galaxy S22, some users are reporting 27GB. On iPhone, iOS occupies about 9GB, with 11-28GB reserved for system data.
Source: Ferra

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