I don't believe there's an S+ character that rapes everyone else like Chun in 3S.
S: Billy, Clark, EX Iori (possibly the other EX characters)
A+: Shen, Saiki, K', Hwai.
A: Everyone else.
B+: Raiden, Terry.
B: Maxima, Leona.
Leona's still good, her Air Super makes her very dangerous, she just takes a little more work to win with. Maxima has guard points as his biggest advantage, but I would say a little more than half the cast can get around that and make it hell for him to get in. I will maintain that Raiden is B+, it's really hard to get in with him, and he just doesn't quite have the damage as Goro or Clark.