The Chinese 4th Generation fighter, the Chengdu J-20, made a new step forward with what is believed to be the first flight of the first production airframe with serial "2011". The flight was conducted at 1st March and lasted about 30 minutes with a J-10S as a chase plane. Painted in a grey scheme instead of black, this airframe also has many improvements on intakes, stabilizers and other details.
source: http://mil.huanqiu.com/photo_china/2014-03/2728600.html