ALDO:
MKSGR:
ALDO:
MKSGR:
RC:
Markus, the 650S and the 675LT are very fast cars once they gain a bit of speed, they (especially the 675LT) basically annihilate everything moving out there at speeds over 160-180 kph. Only hypercars like the P1, the 918 or the LaFerrari are faster.
I do not know how McLaren does that but I guess they have less thermodynamical issues than other car manufacturers. 
Or the just don't care about engine lifespan since many McLaren drivers won't probably drive more than 50k km with a single car...ever. 
(just a wild guess though, I don't have a clue but McLaren cars are certainly beasts when it comes to high speed performance).
But then: it depends on how one defines "annihilate"... Let's say: maybe 2-3s in case of 650s vs 991.2 turbo S (talking of 0-300kph) and maybe 4s in case of the 675LT. The delta is measurable for sure but maybe not enough to compensate, let's say for disadvantages on twisted roads/tracks. In particular as you can replicate the turbo s acceleration times under nearly all driving conditions... Just point and shoot 
The car inhalitates not from 0 but from 40 up. And this is remarkable. When you look at 0-300 times between 911 turbo and 650 and then think about the awd advantage for the start, the you can imagine the rest.
there is no disadvantages on twisty roads, the car has so much grip. Unbelievable for a rwd car.
Not really - 0-200 is already like 0.5 to 1s faster in the 650s. I.e. between 200 and 300 there is just another second or two. Not so much to make a bigger difference 
Still measurable though.
I would not be surprised if the 991.2 turbo s had very similar Supertest times (NBR and HHR) as the 650s... On PZero street tires...
P.S.: I just re-read this Supertest review:
http://www.auto-motor-und-sport.de/supertest/supertest-mclaren-650s-spider-nuerburgring-und-hockenheim-9266605.html
It seems to confirm some of the key statements (including yours) in this thread
650 s
991.2 turbo s
To 100 turbo 0,3 faster, to 200 1,2 the 650 faster and to 300 6,5 seconds.
Maybe you can do some GPS runs? The official 0-300 number for the 650s Spider is 26.5s, i.e. I am not sure the above is what one should expect from customer cars:
http://www.autobild.de/artikel/mclaren-650s-spider-genfer-autosalon-2014-4960987.html
I did GPS runs on the 991.2 turbo s Cabriolet and ended up with 28-29s.
Based on my data the delta would be approx. 1.5 to 2.5s for 0-300 
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