ZUK Z2 Pro is official: Snapdragon 820 and 6GB of RAM for $420

Lenovo subsidiary ZUK just pulled the wraps off the Z2 Pro smartphone, oft-rumored over the past weeks. What sounds like a second model, rather than a successor to the existing Z1, was unveiled at a dedicated event in China.For starters, the ZUK Z2 Pro comes with a smaller 5.2-inch display, as opposed to the 5.5-inch Z1. It also makes a switch from IPS LCD to AMOLED, but resolution remains