Captain Marvel #24.
He fights Dr. Mynde. He gets relatively beat up at first, and then grabs his chick. He gets tossed back by the girl, and then tricks his KO. Mynde then tries to kill him, and Mar-Vell dodges, and Mynde kills his wife, or whatever. Mynde then shoots himself in the head.
Captain Marvel #26.
If you read the last picture... you can guess that he fights Thing.
Now, I think this fight is pretty awesome. Thing proves to be stronger, but not by a monster amount. Mar-Vell gets a couple good punches in, and then, after Thing throws some debris on him, Mar-Vell gets up, shows his battle smarts, and shocks the shit out of Thing. He was about to kill Thing, but he doesn't want to. Oh ya, Mar-Vell thinks he is Super-Skrull.
OK, here is when he gets his powerup, and his usually seen golden hair.
He defeats rock versions of his worst enemies. He also destroys a rock-like darkside of himself.
He also gets cosmic awareness on such a high level now.
Captain Marvel #31.
Here, he kicks the Cosmic Cube out of Thanos's hands, and gets some good shots in.
Ultimately though, he got one-shotted... still a good feat though.
Captain Marvel #32.
This is just so sweet. OK, a bunch of demons appear that Thanos made, and one of them is Iron Man level in strength. A couple of them beat up Iron Man like nothing, and Mar-Vell beats up basically all of them in h2h. Too bad Rick Jones had to appear...
Captain Marvel #33.
Here, he fights Thanos. He gets beat down pretty easily though.
My take, is that the size Thanos we see here, is normal powered Thanos, and the bigger one, was the Cosmic Cube one.
Oh well.
Captain Marvel #40.
He tries to stop a rocket, but realizes that it's futile. He then takes off his Nega-Band, throws it at the other rockets, making them blow up the big one. He did this all, while being pushed back from the big rocket.
That's some aim. (please log in to view the image)(please log in to view the image)