What is the best graphical showcase for the Wii U?

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FAST Racing Neo, no contest.

Physically based rendering, (something almost nothing else on the system can boast) 60 frames per second, superb textures, lighting, and shadows, plus goodies like anisotropic filtering and ambient occlusion that a lot of Wii U games forego.

On a technological level, it has no equal on Wii U.