So not to distract from any bickering above I just sped-read, but yeah, this is pretty accurate.
Sure the Z will probably catch up eventually in a twisty track, but the driver will really have to muscle it through.
Why do I say that? I was just on a track all day today with my G37S trying to catch an FR-S. Sure, I've got a 400lb weight penalty, but otherwise my car is pretty much a 370Z. It's stock minus pads and fluid. The FR-S was apparently stock minus RPF-1 wheels and sticky Nitto track tires. The track was a 2.2 mile road course with 14 turns.
Put it this way: I had to have several excellent laps (without overheating) in a row to reel in the FR-S. It was tough. I'm no pro driver, but I'm decent (only cars to pass me today were a Spec-3 944, a 911, and one Cayman S on track tires). And that said, I never passed the FR-S...I only got close once.
The power difference on the straight was obvious once I had him in my sight, but as soon as the turns started again, it took work to hang with him.
Anyhow, considering the amount of modifications any car that will be constantly tracked will need, the FR-S/BRZ may be a better template to start from. A Z-type car needs too many damn coolers and duct upgrades to be constantly trackable. The FR-S seemed happy stock. You can always add power later.
Long story short, I've been eyeing the twins for a while...I test drove one a few weeks back and thought the handling was brilliant. And I'm 90% sure I'm going to trade my G and pick one up. That's one vote of confidence from a G (370Z) owner...sample size of one/for what it's worth, etc etc.