Getting 50fps average at 1440p max settings, with Gsync it's a massive improvement. The engine is poorly optimised given GTA V is pretty much 60fps solid at 1440p for me, was hoping for 60fps solid but I'll take it over the previous 30fps.
Yeah graphic settings that would net comparable visual quality in GTA V based on the videos/screenshots of Mafia 3 for me with the 1070 would run comfortably around 100fps at 1440p never mind 1080p.