If all you're asking about is physical strength, right now Quill doesn't appear to be stronger than Thor. Looks can be deceiving. But if what you're asking for is a total comparison of superhuman powers, then—well—Thor doesn't stand a chance.
Star-Power
In his new role, Peter can survive in space, fly faster than the speed of light, and generate a personal force field. His other abilities include being able to recover from injuries quickly, super human strength, and universal language translation.
Star-Lord has a vast array of weapons and gadgets, as well as greater experience but his strength isn't that much greater than any other dude (as Drax would say).
Because of his lack of superpowers, Captain America would be an easy matchup for Star-Lord. The ability to fly, plus super strength and durability, make Star-Lord physically superior to Captain America.
Either power would be effective, but combined Star-Lord is able to generate the materials needed to defeat Superman from a process that in and of itself could defeat Superman.
20 Strongest Versions of Spider-Man (Ranked)
Against Star-Lord, Spidey struggles. However, his durability, speed, and raw strength can defeat Star-Lord. Yes, Quill is currently enhanced and has some of the powers he “stole” from Dark Olympians, but Spider-Man is famous for bullet-evading speed, which can only increase.
Captain Marvel is the most powerful and powerful Avenger in the Marvel Cinematic Universe (MCU). Her incredible powers and determination have made her a valuable member of the Avengers.
Star-Lord has successfully killed Thanos in the comics, however, it wasn't a great victory as the Mad Titan didn't stay dead for long. Star-Lord has successfully killed Thanos in the comics, however, it wasn't a big victory like one might think.
7 Star-Lord Has Weak Persuasion Skills
Star-Lord isn't so adept at persuasion, though, even if he can back up his words with the threat of violence. Rarely does Star-Lord convince anyone to do things his way unless someone else backs him up, or if things are so dire, his allies have no choice but to listen.
In the MCU, however, Star-Lord is not immortal. Even though he possesses hybrid Celestial/Human physiology, he lost his immortality when he killed his father, Ego.
Hybrid Physiology: Due to his heritage, he is part Celestial and part human, giving him superhuman abilities. Ego explained to him that as long as the Light of the Planet, which is Ego's essence, is alive, Peter Quill has celestial powers.
Peter Jason Quill is a Celestial-Human hybrid who was abducted from Earth in 1988 by the Yondu Ravager Clan, and raised as one of their members, eventually building a reputation as the notorious intergalactic outlaw Star-Lord.
Thor is repeatedly vanquished by the 5 new Phoenix hosts over the course of 12 issues: Colossus, Namor, Cyclops, Magik, and Emma Frost. Colossus even manages to knock Mjolnir out of Thor's hands at one point, demonstrating the strength of Phoenix and why it should not be trifled with.
Who can beat Thor? In his normal form, with his classic power levels, Thor has openly stated that the Hulk is one foe he can't beat.
Odin. Odin is basically Thor and all the other Asgardians rolled into one—though he's even wiser, more experienced, and minus one eye. As the default King of Asgard, Odin is easily the most powerful being in his realm.
Ah. So Quill doesn't punch Thanos, the Gauntlet comes off, the TVA notices, and the entire timeline vanishes like our hope for the future. Rather than 50% of the universe dead for a few years, everyone is dead forever.
Although Quill (a.k.a starlord) is not a celestial himself due to him having a human mother, he still enjoys some celestial-y perks such as being able to hold an infinity stone without dying.
Who would win, Starlord or Batman? Starlord stomps batman with negative difficulty. Infact, add the entire bat family and give them all their special armors and they still get stomped by Starlord.
Determining the strongest Avenger in the MCU is tricky since each brings something unique to the table, and Thor and Hulk are the top contenders in terms of sheer physical strength. However, regarding versatility and range of abilities, Captain Marvel and Doctor Strange are formidable opponents.
Sadly, one of Peter Quill's greatest foes turns out to be his own father, the Celestial known as Ego.
The films have chronicled most of Peter Quill's life specifically, as the first movie showed his origin in 1988. He was kidnapped at 8 years old shortly after his mother's death. The movies primarily focused on Star-Lord when he was 34 years old since Guardians of the Galaxy and Guardians of the Galaxy Vol.
Star-Lord and Gamora are the only members of the Guardians without the final Rank of title "Guardian of the Galaxy." He was originally supposed to have 5 ranks.