You can't say the same because there's no updated Sonic MU sheet.
And it doesn't matter if Sonic's overall MUs are worse than Wolf's. What matters is the match ups that count. Last time I checked, Sonic's only concerns in S-B tier is Lucario, a small problem (pretty negligible if you have decent experience in the MU) with Falco, and MAYBE Olimar.
Wolf? Pikachu, King Dedede, Wario, and Ice Climbers.
Yes, Wolf doesn't get SUPER countered by them, but they all have tools against Wolf that put him in terrible positions, whereas the worst thing Lucario can do to Sonic is live long.
As you move farther down the list, Wolf's match ups quickly turn to his favor or into even match ups. Sonic more or less has the same pattern, but it fluctuates a bit more. For example, Sonic goes even with most of E-Tier, and even has a losing match up to Yoshi.
Point being, Wolf and Sonic should have very similar MU spreads. On average, considering the entire cast, Wolf probably has a better looking MU spread. However, concerning viable characters that you will most likely run into at tournaments, you're just as likely to have just as much trouble with Wolf as with Sonic, if not more.
One reason I believe this is still difficult to gauge is because of how dominating Meta Knight is (and to a smaller effect, Diddy Kong and Snake. Maybe even Falco), since they poop on all the characters that give Wolf and Sonic a hard time.