Both Wii U and the Xbox One sales have been absolutely dwarfed by the PlayStation 4 in recent months. The PS4 has shipped roughly 63 to 68 percent of all "current generation" consoles in recent months. That's significantly better than the (still impressive) 48 to 49 percent of the shipments that Sony can claim over the life of the current console generation. In fact, the shipment of six million PlayStation 4s from April to September is only slightly below the lifetime shipments for either the Xbox One or Wii U, and that should tell you something about how well Sony's system has been doing of late.