In a discussion with Eurogamer, SCEE’s  David Reeves, has said that Final Fantasy FFXIII being on the Xbox 360 is unlikely to affect Sony.  

Reeves said "I think that just as we got a massive blip up [in hardware sales] with GTA IV — which was not exclusive — we’ll get exactly the same blip up with Final Fantasy... I know it [FFXIII] will look great on PS3 and it’s up to Microsoft to clarify this but it’s still exclusive in Japan".

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