DonFerrari said:
Have I lost myself in outer space??? Shouldn't the real numbers for end of 2015 be PS4 19-20M and X1 10-11M??? So PS4 is already at about 9M gap, outdated thread?

Yes. Assuming the Xbox One get to 11 million on chartz,  the PS4 will get to 19 million regardless so the gap is at least 8 million. So the total gap at the end of this year should be approximate to the Xbox One YTD totals. This may be a good rule of thumb actually.