Hmm, this doesn't seem right, or at least conflicting. I had it guesstimated at ~3m PS4 2.5m XBO at end of 2015 based on this http://www.mcvuk.com/news/read/the-year-that-was-2015-in-numbers/0161201
Which had PS4+XBO=5.5 million, and software share at PS4 36.3%, XBO 29.7%. (applying that software rato to 5.5 million hardware comes out roughly 3m, 2.5m respectively, likely a good guesstimate.)
The MCV numbers seem more trustworthy to me.
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