The Camry’s V6 residing in the Evora probably has more to do with agreements already in place between Lotus/Toyota that help reduce the cost of procuring an engine for that platform. Since a four banger would be unacceptable for the Evora’s price range, and none of Toyota’s V8s would sit well in a transverse mid-engine layout, it’s probably by default that engine was used.
As for the GT-R coming out and setting a new benchmark… That’s what they do. Anything less would have been an embarrassment.
Thing is, Nissan’s been playing with electronically controlled AWD, four wheel steering, turbocharging, high output six cylinder engines for over 20 years now… Granted, there has been a ton of innovation going from the R34 to the R35. But the overall design is still based on an FR layout with ATTESSA and all of that good stuff.
The LF-A on the other hand shares nothing with any model before it.