The Sony Xperia Z series is dead, long live the Xperia X series as the Xperia X and Xperia X Performance get every single model, including their dual-SIM models, detailed. Funny how the devil’s in those details.
It’s not just twice the nano-SIM slots that you’d be getting on those models: the specs sheet within the white papers Sony published listed flash storage “up to 64GB.” For reference, the single SIM versions of each device only have up to 32GB of internal storage. Oddly enough, 12GB of the 32GB disks are taken up by firmware. It occupies 19GB of the 64GB versions.
All Sony Xperia XA models only contain up to 16GB of storage.