Asus unveiled the UX305, its newest flagship laptop at IFA 2014 this week. The device, it claims, is the world's thinnest 13-in QHD+ ultrabook, giving it one of the highest pixel densities of any computers on the market.It faces competition from the Lenovo Yoga 2 Pro and the Samsung ATIV Book 9 as well as the Apple MacBook Pro Retina Display, although we expect vendors to refresh their current thin-and-light laptop range very soon.