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"Sony announced at CES this morning that the PlayStation 4 has sold through to consumers 4.2 million units of its next-generation console as of December 28. Sony's new console reached the one million milestone within 24 hours of its release and went up to 2.1 million units worldwide by December 1.
Yesterday, Microsoft announced that the Xbox One sold over three million units by the end of 2013."
And it has not even released in Japan yet, so you can probably expect that number to be boosted greatly once it does.