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I suspect the technology improvements with time are similar for Porsche and BMW. The latest gen of PCCB discs do seem to fare better than the last gen. Racing brake is also an option for aftermarket CCM rotors made by surface transforms. I believe it's still about 12k for four corners. A set of these, in my opinion, are nice because of the very reasonable refurbishment cost.
If hell bent on CCB rotors, then the factory option is highly subsidized by BMW.
There's likely not much stopping someone from getting some CCM rotors for the front and getting some two piece rotors for the rears and bias with pad selection. Gets the weight off the nose for about 5k.
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