7 marker at turn 1 at VIR? I was hitting the brakes a little bit before 5 on my Prius in the rain. The Z can easily do it in 5 if you have good tires and 4 if you have slicks.
Here is a good brake test article. The popular Carbotech is not listed there, I believe they will rank somewhere in the middle to lower middle of the test based on my experiences with some of those pads.