Sony Xperia z5 premium is the first 4k phone to market with a 5.5 in 2160p pixel display that has a crazy high pixel density of 806 ppi.
The Premium is necessary larger and heavier than the standard z5, and has a slightly larger capacity battery in other respects it’s the same phone which means you get a qualcomm snapdragon 810 Processor, 3GB Of Ram, microSD Support up to 200gb, 23- and 5MP Cameras and a brand new fingerprint scanner.