Not sure if that's 9 million shipped or sold through and that X1's figure is shipped or sold through.
Nonetheless, almost 4 million lead is impressive.
http://www.ibtimes.co.uk/microsofts-phil-harrison-xbox-one-kinect-ps4s-success-hats-off-sony-1455080
Asked about bridging the gap between the two console's sales figures (Sony report 9 million units sold, Harrison says Xbox One's figure is "north of five million") he says: "Some analysts will suggest that we are less than 5% into this generation, so there is plenty of market opportunity ahead of us.
Nonetheless, almost 4 million lead is impressive.
http://www.ibtimes.co.uk/microsofts-phil-harrison-xbox-one-kinect-ps4s-success-hats-off-sony-1455080
Asked about bridging the gap between the two console's sales figures (Sony report 9 million units sold, Harrison says Xbox One's figure is "north of five million") he says: "Some analysts will suggest that we are less than 5% into this generation, so there is plenty of market opportunity ahead of us.