I think the surprising thing to see (although I kind of knew) is how little IPC Intel have gained since moving onto 14nm with Broadwell.
Adsitional instruction sets mean other programs may see more, but on a like for like basis not much for years now.
Yeah, Sandy Bridge - Ivy Bridge - Haswell - SkyLake and i suspect CoffeeLake are all with in 15% IPC of eachother.
They are all pretty much the same architecture, just refined and enhanced from the last, much like Bulldozer to Vishera to Excavator, the biggest difference is between Haswell and Skylake, that is as much as 10%, Sandy Bridge to Ivy Bridge about 3 or 4%, SkyLake to CoffeeLake nothing.