Still behind PS4 sales, though, which means not only were the sales very low lately, and this doubling up starts from a low base, but also on the decline, if they made the decision to give up Kinect, something they've been promoting for years as a "special differentiation feature" of their console.

For the dollar/unit per performance metric, you also still pay about 50 percent more for an Xbox than for a PS4. To match the PS4 there, the Xbox One would need to cost like $250.