Great showing considering the amount of backlash and the fact it's the first time a major (non-MMORPG) installment of the game appears on Xbox 360. It bodes very well for American numbers for the 360...
http://www.mcvuk.com/news/37995/PS3-claims-54-of-FFXIII-sales
PS3 claims 54% of FFXIII sales
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Slight majority of epic RPG’s sales fall in favour of Sony's next-gen machine
The fact that FFXIII has this week claimed the top spot in the ELSPA GfK Chart-Track All Formats Top 40 is of absolutely no shock – but onlookers will be far more interested to see how sales were shared across PS3 and Xbox 360.
And the truth is – in the UK at least – that it was a very close battle. Though MCV is unable to publish specific numbers, we can reveal that Sony’s console claimed 54 per cent of the game’s six-figure sales in its first week of release.
Seeing as the Final Fantasy series is traditionally so intrinsically tied to the PlayStation brand, the result is perhaps not surprising – and Microsoft will probably be quite pleased at claiming a very respectable share of the week-one unit sales.