I can't say that the sprites look much better.
I don't have a Wii nor have I seen any of these re-releases inmotion yet.
I think a lot of the companies aren't just straight re-releasing them as was.
I think they are going back over them and giving them a spit and a polish ( totally a technical term.....go wiki it.)
I wanna see more hand drawn stuff.
Or King of Fighters XII