I doubt it out performs F35A in every flight regimen. I would hazard a guess that the instantaneous and sustained turned rates in the F35 are far better than then F-105, as would be instantaneous and sustained G. Additionally these days you have consider the systems on the a/c and the ability to employ those systems as a flight characteristic, in which case there is no comparison.
But the fundamental difference is the F35 'performance' is optimised for Low Observability and so there is always going to be a slight compromise in terms of pure airframe performance to maximise (or minimise) radar cross section. As for the F-15 - great aircraft. But its not going to last that long in the type of airspace that F35 was designed to go up against.
Last edited by AutoBit; 13th Apr 2016 at 02:00.