@MikeB: For me, the real interesting question (and the one we'll probably not get an answer for) is: What is limiting KZ2's performance as it stands? Very likely there is one element of the system that they ran into, as it happens with any advanced game which tries to push the hardware (i.e. mostly games from technically excellent teams).
Note the "as it stands" part, I'm not talking about hypothetical advantages of the PS3 architecture that they haven't taken advantage of. Talking about unrealized improvements doesn't answer my question in the least. If they're using the GPU fully, those hypothetical improvements haven't yet come into play to negate that.
My point is that the only thing we know is that it's not a lack of SPU cycles, as they aren't fully using the Cell. Maybe the GPU is being nearly fully used, or something else.
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