I'll just say these things:
The Jazz sprite up there is awesome. A couple billion times better than the old one.
But if you're going to make another person make the Sonic sprite, it will obviously look different. And nobody wants to completely adapt to a given style. That's too much like solving a math problem.. you don't get to be creative.
So, whatever you do, DO make the sprites yourself if you don't want the game to look like a patchwork carpet.