What are you reasons for saying Zelda U will be able to compete with PS4 type visuals?

[JNK]

mario kart already did.

Artstyle often is also more important then raw hardware power.
Also the gap in terms of graphics between wii u and ps4 is not THAT big.

 

Ps4 games like driveclub and order1886 does also look better then many/almost all pc games on ultra, even if a pc is way more powerfull.