Coming off the back of the 360 generation which was the biggest selling console in the UK, despite the Xboning fiasco there were still many going for XBO by default in 2013, or they were waiting for XBO to come down in price. MS still had the CoD and FIFA marketing rights at that time too. Couple that with PS4's lacklustre line-up, and the PlayStation hype was nothing at that time compared to where it is on the back of this generation.
So not a huge surprise, even moreso when you consider Sony's masterful drip-feed marketing this year and very nicely choreographed showcases.