Right now the most advanced Windows Phone device is a tie between the Nokia Lumia 1520 and Lumia Icon. They pack nearly identical tech, just in different packages. The Lumia 1520 has a 1080p display on a 6-inch screen, while the Icon packs the same resolution into 5-inch screen. Other than that the two smartphones are identical in specs (yes, the Lumia 1520 has a microSD slot). However, the Lumia Icon is only available in black or white. The Lumia 1520 is a little more Nokia in that it has a handful of colors, one of which will reportedly soon be green.
Full story from the WPCentral blog...