Obiously I'm asking rhetorical questions.
I find Porsche is pretty backward when it comes to tech and engines. Once they start to gain access to Audi's tech, I will start to consider a Panny instead of an M5. Until then, it's no context imo.
My guess is that the next gen GTS will have the Audi S8 engine and it will be glorious.
2014 Porsche 911 Turbo S
2015 Mercedes-Benz C300 Sport 4MATIC