In an in-depth interview with Next-Gen, Greenberg said:
"What we've heard anecdotally from our retail partners is that the Xbox 360 version of the game is outselling the PS3 version by a margin of two-to-one.
"That mirrors what we saw with pre-orders, but it continues to hold true at retail, at least for the first couple of days. It's a great sign."
However, a SCEA spokesperson questioned Microsoft's claims, telling Next-Gen that Microsoft's figures "don't line up" with what Sony has been hearing from US retail.
The spokesperson declined to give Sony's sales data 'until more concrete data could be compiled'.