World's First 4K Smartphone is here! The Sony Xperia Z5 Premium brings a metal build with the first UHD or 4K Display to the market. Z5 Review coming soon! Will this better than the iPhone 6s or the Samsung Galaxy S6 and Note 5? The Premium packs a new 23MP Exmor RS Sensor with 4K Video recording, Snapdragon 810 processor, 3GB of RAM and more.