Review: Sony Xperia Z5 Premium

Introduction and designSony has gone and done it: this is the first ever 4K screen on a smartphone. That's the big headline for the largest of the Xperia Z5 family, and it's a truly remarkable feat from the company.It's no secret that Sony has been struggling in the mobile phone game for quite some time, and the Japanese company has come back strongly with its new Xperia Z5 series.The family includes the Sony Xperia Z5, which has a 5.2-inch Full HD display, a new frosted glass design and a finge