That's right, Superman. One reason why- magic. Besides Kryptonite, magic is Superman's biggest weakness, and as an Asgardian, Loki is a being of magic. He may not be as strong or as fast as the Man Of Steel, but he doesn't really need to be.
The greatest and most challenging foe Loki has faced is perhaps his own brother, Thor. While the two were raised as siblings by Odin, envy drove Loki's desire to overthrow Thor., Loki is frequently defeated by the god of thunder, but is never discouraged from persevering in his efforts.
Lose: Loki
Not to mention if he were to ever come into close contact with Loki, Batman would undoubtedly win, as Loki is not at all skilled in hand-to-hand combat. Loki is not an easy force to go up against, but fans could see Batman outsmarting him.
Shazam would be able to overpower Loki, but once the God of Mischief realizes what he's dealing with, he'll formulate a strategy that will allow him to defeat Shazam. Loki would allow Shazam just enough leeway to think the fight was won before springing his true trap and taking the hero down.
Superman is stronger than Thor and would win a fight against him the majority of the time. Superman has physical strength, speed, and durability as his advantage. That isn't to say that it would be an easy fight, Thor still has access to magic, and this is one of the most notable weaknesses of Superman.
If Superman had no weaknesses at all, no Avengers would have a chance in front of him. While Superman is known for his incredible strength, speed, and other superhuman abilities, there are a few Avengers who could potentially give him a run for his money.
Of course, even despite his Asgardian strength, Loki is no match for the Hulk so he doesn't bother using his strength to subdue the beast. He manages to use something else. Loki realizes he can't beat or trick the Hulk so he does something a little different: he rips the gamma radiation out from Hulk.
Iron Man defeated Loki, quite one-sidedly 87-18, Looks like fan sentiment overcame Loki's magic.
Spider-Man has fought some of the most dangerous foes out there, but his battle with Loki was one of his most unconventional. He tried to fight Loki like he normally would but this was pretty hopeless, as Loki is Spider-Man's superior in every way.
Loki would win in a fight against Captain America. This is because the God of Mischief is stronger, faster, more durable, and more intelligent than Captain America. It would, however, be a close call in Loki's favor because Cap's willpower wouldn't allow him to give in even when Loki has the upper hand.
Loki tries to use his abilities as a trickster god to turn on Thanos and kill him, but Thanos quickly stops his arm and breaks his neck. After Thanos kills him, that Loki's MCU run is over.
Joker. They are matched in emotional damage, dangerous mischief, and genius-level criminal mastery, but they are unmatched in fighting ability and training in the mystic arts, of which Loki has the best advantage.
Loki's greatest weakness is water and his spells do not work in water.
Liesmith. Loki possesses strength, durability, and longevity far superior to humans. The most powerful sorcerer in all of Asgard, Loki's magical abilities include astral projection, shape-shifting, hypnosis, molecular rearrangement, energy blasts, levitating, conjuration, cryokinesis, telekinesis and teleportation.
Loki and Thor are both gods and have immense godly powers that make them somewhat impervious to harm, though they can be beaten; they can lose eyes (Thor) and they can die (Loki). If the metric is physical strength, then Thor is easily the winner.
Loki is much more skilled than Thor in the use of his powers. He has to be because even though he is more powerful than the other Asgardians he is tremendously outclassed by Thor and Odin by magnitudes of power.
This is even true of Avenger Prime, the one who took it upon himself to unite them all, and who turned out to be none other than Loki. Or rather, one Loki out of an infinite number, as well as quite possibly the only one of them who will ever truly be a hero.
While Superman could potentially overpower Thor, blows rendered by the mystical Mjolnir would likely impose serious damage on the Kryptonian hero. However, with his super-speed, the Man of Steel could probably avoid the Thunder God's lightning.
Loki is a god, or near immortal deity. He far and away outclasses Deadpool. To understand the different playing fields by which each character has been crafted to participate in, one must understand the sub genre of comic story that both were crafted to take part in.
While Loki is smarter than Thor, a lot of his magic wouldn't work against Ultron and it's doubtful that anything Loki could do would crack Ultron's adamantium shell. Loki also doesn't know any of Ultron's weaknesses, meaning there's nothing he could exploit. That would spell doom for him in this fight.
Simply put Thor can best Hulk in a fight because he wields Mjolnir and is a god. Complexly said, Hulk can't defeat a divine god with a mighty hammer that lets him blast energy beams, fly, and summon a kinds of weather.
In terms of the power to lift and move large objects, Superman has a stronger edge against Thor. Thor may have been able to move objects that weigh as much as planets, but the Silver Age Superman not only pushed actual planets out of orbit all the time, but even went so far as to move entire galaxies on a whim.
When it comes to raw strength, Superman is more likely to outmatch Captain Marvel. Based on how their powers work, Captain Marvel is almost always at maximum capacity with her abilities, whereas Superman can only grow stronger the longer he is under a yellow sun.
So it wouldn't be much of a surprise that Tony built, or at least could build, an Iron Man suit capable of beating Superman. Most likely, the whole suit is made of Kryptonite, so it would not only beat Superman, but quite possibly kill him. Superman's defeat, however, is only down to Tony Stark having enough prep time.