Not really sure where people are getting 5:1 or 6:1 from...
If the PS4 has sold about 9 million, how in the hell has the X1 only sold 1.5 million? Even 5:1 is stupid, it would mean the X1 has only sold 1.8 million.
Let's say the PS4 is at 9 million and the X1 is at 4.5 million, just to make the Sony fanboys happy, that would mean it's only at 2:1.
What you're not taking into account is that most of the Xbone's sales are from 2013. LTD sales are 2:1 but the PS4 is currently outselling the Xbone 3:1 overall and the gap is always growing. In Germany it's already 5:1, btw: http://www.neogaf.com/forum/showthread.php?t=866924