I highly doubt that Uncharted 2 will have as big a first week as Killzone 2. And the reason for that is the insane hype that surrounded Killzone 2, from its first pre-rendered target video. Uncharted 2 might do well in the long run, probably better than Killzone 2, but the first week is a defaulted win by Killzone.
Also, as I remember it, didn't the original Killzone sell around 2 million on the PS2? It did tons better in Europe than in the Americas, anyway. And the Killzone 2 beta was also very positively recieved, and written about in grand letters all over the internet.
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