>Iron Man beats Superman
Even Tony's weakest armor can hold its own against a suppressed Thor or Hulk, both of whom could rape stomp a Superman operating at around 50% power. So if that's what his lower-end suits can handle, then his most powerful armor could easily man-handle Superman at full strength (without any outside amps), just him going all out.

>Popeye beats Vegito
Vegito has no reliable way to permanently kill Popeye. Popeye not only outspeeds him, since Vegito is at best infinite speed, while Popeye scales to immeasurable speed. Vegito either gets hax-stomped or Popeye stalls until the Potara fusion runs out, or he just uses Fission Inducement to split Goku and Vegeta apart.

>Sonic beats Mario
At his peak, Mario caps at Large Star level with a Power Star, and in base form, he’s only Multi-Continent level, and he has no universal feats. Sonic, on the other hand, is at least planet-level in base (having defeated Perfect Chaos without the Chaos Emeralds), and Universal as Super Sonic. Also, Mario's hax is meaningless since he can't hit Sonic.

This is the truth, take it or leave it.