They are both great cars, and I've owned and tracked several of each. Neither one does a very good job of replacing the other. M3 owners need to realize the ZO6 is a much higher performance car. Similarly, the ZO6 is embarrassed if attempting the role of a good sports sedan. Get both, or get over it.
2011 Space Gray Coupe, DCT, ZCP, StopTech ST-60/ST-40 BBK.