I think it is important to remember the following.
The Cayman GTS is a lighter mid engined car which is setup for handling, The F-type is set up for big noises and big slides.
The F-type isn't all that far off a Carrera GT which is pretty impressive for that Cayman as well and it's the same as an Audi R8 V10.
It's 1.8 seconds slower and 40K more than a Corvette z51.