Since all the characters you're talking about started their lives as 2D sprites, I think they'll survive having detail added to their 3D models.
The transition from 2D to 3D is way bigger than the transition to HD.

"The worst part about these reviews is they are [subjective]--and their scores often depend on how drunk you got the media at a Street Fighter event." — Mona Hamilton, Capcom Senior VP of Marketing
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