Graphics Comparison: Star Fox Zero vs Star Fox Assault

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It doesn't look like Gamecube graphics simply for the fact that the Gamecube was locked to 480p.

Textures and shaders are also noticeably above GCN calibre. 

Yes, it looks horrid by Wii U standards, but let's not get carried away; it looks like a 2006 PS3/360 game, not a Gamecube game.