I think you're mixing something up. PC's currently have trouble running a smooth 60fps @ 4K unless you drop $2k+ on hardware, and even then things like lighting, shadows and particle effects will suffer.
On the console side, the PS4 and XB1 are currently capable of running a lot games at 60fps @ 1080p, which means the updated PS4 Pro and XB1X are definitely capable of running damn near anything at that resolution and framerate combination.
This whole 4K on console nonsense irritates me to no end because of the "technically-true-but-also-misleading" marketing speak we've been hearing over the past couple of years. The vast majority of 4K console titles announced are either previous-gen "remasters" with true 4K texture updates, current-gen games running at non-native 4K via checkerboard scaling, or Forza / Gran Turismo.
We're not going to see a true 4K, visually next-gen, non-racing/sports game on consoles for a long time. Exactly what Microsoft and Sony are trying to sell us on, which I find disingenuous.