Unlocked Sony Xperia Z5 Premium (international variant) now available in the US

Officially announced in September, the Sony Xperia Z5 Premium is the world's first smartphone to sport a display with 2160 x 3840 pixels (4K). However, only media is rendered in 4K, with the screen - a 5.5-inch panel - acting as a 1080p one during normal usage. Other highlight features of the Z5 Premium include a water-resistant body, fingerprint scanner, a 23 MP rear camera with fast auto focus, octa-core Snapdragon 810 processor, 3 GB of RAM, 32 GB of expandable storage space, and a 3430 mAh battery.
sources: Amazon, Expansys (Xperia Z5 Premium single SIM, Xperia Z5 Premium dual SIM)