The PS2 was at about 5 million units at the time of release of FFX. That is about 1 million more than the current PS3 install base.
If you consider the attach rate of 3/8 for FFXIII (1.5M sold out of 4M PS3 owners, you do the math), it will be the same, if not better, than the sales of FFX, which I consider to be one of the best games of all time.
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