Killzone 3's first week sales in the UK failed to better those of Killzone 2, GfK ChartTrack reports.

While Killzone 3 is the 14th fastest selling Sony title in terms of week one sales, Killzone 2 (released two years ago), is the company's 5th fastest selling title and remains the series' number one in terms of week 1 sell-through.

Killzone 3 is Sony's 2nd All Formats No.1 this year, following LittleBigPlanet 2 in week 3, which showed similar week 1 sell-through to Killzone 3.

Killzone 3 beat Bulletstorm to the top of the UK All Formats All Prices chart.

There's no doubt that Sony has got off to a great start in 2011, with two first-party exclusive titles charting at No.1 already. While sales of Killzone 3 perhaps aren't as high as Sony would have liked, launching alongside the highly rated Bulletstorm wasn't ideal.