Skylake has 8 threads same as amd and it scales As good if not better than the fx chips. I'm sorry unless amd whips something out of their ass with zen skylake officials beats and in all things.
You're right but at anywhere from twice to five times the price of current FX 8 core chips the skylakes had better outperform them running the same amount of threads.
In fact the whole difference in performance is a performance per dollar thing. Both 2 core i3's with HT and 4 core i5's w/o HT run quite a bit faster than FXs at around the same pricepoint as the FX's on a clock for clock basis. However
the FX's pull away when multutasking simply because of more cores, this is true of both 6 core AMD's and 8 cores.
Now the 4 core i7's with HT do get close to matching the FX 8 cores clock for clock when running all threads but, and this is a big but they have a much higher pricepoint.
But then again AMD is it's own worst enemy here in a way because my $140 FX-8320 can easily be Overclocked to 4.7 Ghz stable on an 8 year old discontinued top down air cooler and match a $230 FX-9590 at it's stock speeds.