I don't think Nissan missed. Have you driven a Cayman S? I have, several times. It feels similar to the z during normal driving. And the z hides it's weight very well because it has tons of grip. I've never taken the z or Cayman to the track so I can't compare the 2 there. Bnd the Cayman's cheap interior (not the new 981 based cayman) isn't as nice as the Z's IMO (one of the biggest complaints of the 997/981 based cars, especially the cheesy cup holders) but hey, everyone's entitled to their own opinion
Give Nissan credit, they make the GT-R and it beat the 911 turbo (which was the performance goal) around the Nurburgring.