According to figures obtained by MCV in the first 48 hours of sale, over 250k PS4s were sold in the UK alone - with the Xbox One trailing with only 150k units sold in their first 48 hours.
First blood to Sony then? Unfortunately we don't have numbers on sales since - but don't forget the Xbox One had a two week head start, so the picture could be very different. The disparity between the two though in their launch 48 hours does point towards the PS4 carrying more hype - especially amongst the hardcore gamers and early adopters.
Piecing together the worldwide picture is also difficult to compare: Microsoft have apparently said they sold a million Xbox Ones worldwide within the first 24 hours of the worldwide launch - but the best stat we have for Sony is that they've sold 2.1 million PS4s worldwide... in all of November.
So whilst we can't figure out exactly who is winning at the moment, we can point to the loser. That 150,000 Xbox One figure is significant because it means in 2 days the One nearly outmatched the Wii U's total sales figures - from since the console was launched in the UK - which was almost exactly a year ago, back on November 30th 2012. Poor Nintendo.