WiiU's performance level is well above what the PS3 and the Xbox is capable of.
Heck put Killzone Shadowfall in 720p and take off some motion effects and it'll run at 60fps on the WiiU. Giant backgrounds you cant touch and all.
As an owner of a projector and all three consoles I'd have to completely disagree with you. Not that such evidence has to be personal as eurogamer faceoff's have shown about 90% of wii u games run worse than 360 and PS3 versions. There simply is no evidence to support your claim. Not that I'm claiming the wii u isn't superior in some areas but overall its at 360/PS3 level and thats a huge compliment to the wii u because quite frankly it isn't performing at their level yet.
If you look at almost any recent wii u game it is struggling to match the frame rates of 360 and PS3. Often there may be minor visual effects missing from wii u versions of games too. Ghosts below but same applies to games like resident evil, ass creed black flag etc. The wii u has yet to prove itself as capable as ps3 and 360. The wii u is meant to be exceptionally easy to develop for and we are now in year into its life and its still struggling to match the earlier consoless just as it did at the beginning.
Mario 3D World while visually attractive is not technically impressive at all. Windwaker is upscaled gamecube game. While I am keen to see the wii u perform to a higher level I've yet to see that happeen.