In 2013, a high-end smartphone should have a full-HD 5-inch screen and a 13-megapixel camera to remain competitive, if products launched at International CES in Las Vegas this week are an indication of the state of the art for mobile devices. CES may not be a mecca for new smartphones, but this year's show offered interesting products from Sony, ZTE, and Huawei, which underlined some of the hardware trends from the end of last year, including the move to full-HD 5-inch screens.