Which Nintendo IP had the most impressive leap to HD?

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wombat123 said:

Mario Kart 8. Some people may say Xenoblade X but I might be in the minority in that I really liked Xenoblade's graphics and still think they look decent when compared to XCX.

I think XBC's vistas are striking, but XCX took it to a whole 'nother level. The sheer size and seamlessness of its world was mind boggling.