OPINION: Sony’s Xperia Z5 Premium is claiming the title of the world’s first 4K resolution smart phone. The phone, which boasts a 5.5-inch 4K UHD (3840-by-2160) screen, at 806 PPI (pixels-per-inch), is essentially party-crashing the 4K handheld market, one that Sony hopes to capture just by being first to enter. But it doesn’t matter if you are early to […]...