Nope.
Don't look just at the resolution, look at what they're doing AT that resolution.
Let's call what the game is trying to do (big world, big textures, high poly counts, realistic animation, post process effects, HDR lighting, tons of particles, physics, AI, etc.) Content.
then: Resolution = Power / (Content Framerate)
or: Framerate = Power / (Content x Resolution)
or: Content = Power / (Resolution x Framerate)
Given fixed Power for a console, you can get whatever Resolution you want by varying Content or FPS.
If you took Forza 5 and put it on Wii U it couldn't run at 1080p at a playable framerate (ignoring the fact Wii U doesn't even have enough RAM).
If you were taking a game from Wii U as is, it would run much faster at 1080p on XB1. Heck it could probably run every Wii U game in 4k.
