Have to disagree with you guys on this one...How does a Z4M even compare to this car?? I guess if you're talking 0-60 times, then sure. But the 8C isn't about that; it's arguably one of the most beautiful cars to hit the streets in the US. And with less than 85 (Yes, eighty-five) cars headed to the US, you won't likely be bumping into another 8C on your way to the grocery store (Like a Z4).
The 4.7L is from the Maserati cars, but it was developed by Ferrari and is closely related to the 4.3 in the F430; the motor is pure Ferrari with Alfa heads. The car also won't cost $300k, more like $225k. I know, still very expensive; but when buying this type of car, you're looking at exclusivity, craftsmanship, and all around ability.
It's not the fastest car, but it doesn't have to be, it more than makes up for it in styling, driving feel, cache and exclusivity. And since when is a zero-sixty time of less than 4.5 seconds not ballsy?? This car is packed with tech that no Z4 can touch. Frankly, that's an apples to oranges comparison.