The newly announced Nokia Lumia 1520 introduces many first for Nokia - It is the first from the company to feature a 6 inch full 1080p HD display and it is also the first to be powered by a quad-core processor. Nokia has packed all this power into its familiar colorful polycarbonate bodies and even added a 20 megapixel PureView camera with Carl Zeiss optics for good measure.
source - PhoneArena