Iron Man: Mark L
The Mark 50 suit is the most recent Iron Man armor that he utilized during the events of Avengers Infinity War. It utilizes nanotechnology and is far more advanced than any of his previous suits, exceeding them all in virtually every category.
The Mark 50's most unique attribute as compares to previous suits is its nano tech. Due to this Stark is able to form his suit off of his clothes as shown above. And he is able to use it to easily create various weapons.
He is able to create a shield in a split second.
These shields are durable enough to completely no sell Cul Obsidian's hammer strikes.
And endure a beam of energy from the power gem.
He forms a set of extensions to charge up his repulsors for a powerful attack.
As shown in a tie in comic these extensions can fire blasts that circle around destroying all the weapons encircling Tony(This bit also shows a good feat for his shields no selling energy weapons).
Marvel's Captain Marvel Prelude #1
He can create a jet boost to propel himself into the air faster.
Here Tony uses his nanotech to create a device to lock onto and hold him in place on one of Thanos's ships.
In this instance he creates a larger(and likely more powerful)blaster over his repulsor.
It was heavily implied that it would one shot Drax.
Here an interesting one. He places a glove of his armor over the gauntlet to keep Thanos from using it.
He can use his nano tech to create half a dozen missiles on his back(So Thanos couldn't see them)that he than used against Thanos.
He can form a large blue bladed weapon to attack Thanos with.
Crafts a sword to use against Thanos.
This tactic failed and Thanos used the sword against him but it does show you how powerful said sword is that it was able to pierce Iron Man's armor.
Here he repairs a hole in the side of a space ship with nitrogen.
It's been shown in a tie in comic that his nanites have the ability to deploy at extreme speeds, well enough to block energy weapons.
Marvel's Captain Marvel Prelude #1
Strength wise the Mark L is easily a powerhouse by MCU standards rivaling the likes of Thor and Hulk in this category. Now let's go over its feats.
It's strong enough to break Cull Obsidian's restraints.
Here he slams a building sized spaceship onto Thanos.
Admittedly it should be noted that the Gravity on Titan was weaker than on earth, particularly in some areas where people where floating. But as you can see, clearly Thanos himself is not floating and is standing on the ground regularly so the gravity must have been decently high here.
Additionally Iron Man didn't just slam it into the ground but he did so hard enough to create a massive shockwave.
Here Iron Man breaks out of Star Lords' electric restraints.
This device being strong enough to restrain one of Thanos's arms.
Here using a shield Iron Man is able to completely halt an overhead blow from Cull Obsidan with one arm.
Now this shield isn't like Captain America's where it absorbs the energy of an incoming attack. It's just a shield(though a very powerful one)so this is still a strength feat.
Cull Obsidian being Hulkbuster tier physically and having excellent striking feats like launching Iron man thousands of feet.
Here after the suit was horribly damaged he blocks a hit from Thanos.
Thanos may have been holding back against almost everyone else but in this instance he was definitely trying to kill Stark.
Mind you Thanos has very easily overpowered the likes of Thor(Though he was weakened)and Hulk. This should arguably place Iron Man on a similar pay grade as said individuals.
Here he staggers Cull Obsidian, dazing him for several seconds.
Mind you Cull is barley bothered by Hulkbuster's punches.
Iron Man can stagger and hurt Thanos.
He even draws blood from the Mad Titan.
Though it should be noted that that drop of blood didn't come just from what Iron Man did to him but from others before this point. Its still ridiculously impressive as a significant portion of what hurt him clearly came from Iron Man.
The suit doesn't have many feats but the ones it does have in this category are excellent.
Iron man only really has one energy feat and it's a nice one. Here he endures Thanos concentrating his explosives back at him.
This beam of energy had enough force to send him flying back hundreds of meters through a building sized metal object. And Iron Man returned later with no notable damage.
In a tie in comic Tony gets hit by a large mechanical ram device that he was using to test the durability of the suit.
Marvel's Captain Marvel Prelude #1
Here he gets launched far into the air by Ebony Maw.
In this showing below Thanos creates a swarm of bats and sends them rushing and slaming Iron Man along through metal objects and destroying them.
Iron Man tanks a hammer strike from Cull Obsidian that launches him thousands of feet and through a small building.
When you look at it closely Cull's hammer sent Iron Man much farther than you may have originally realized.
The building Iron Man went through is so far in the background that you can't even really make it out. So Cull legit sent him flying multiple city blocks before he even reached that building. And Iron Man wasn't notably damaged by that attack.
Iron Man takes a direct hammer strike from Cull Obsidian.
Withstands multiple hits from Thanos.
Here he endures a beat down from Thanos including a power gem enhanced punch.
This did hurt him but it's still quite impressive that he survived as Thanos can easily KO the Hulk in about a dozen hits.
Here is what is arguably Iron Man's best durability feat. He takes a house sized meteor slamming into him at such speeds that it was heating up just from moving.
This is an extraordinary feat. That meteor would have weighed hundreds to thousands of tons and slammed into him an extreme speeds.
Iron Man uses his nanotech devices and regular repulsors to create a very powerful blast that launches Cull and hurts him severely.
Iron Man's repulsors can negate the momentum of a car Maw had thrown forward and launch it back at him.
When deflected can cut down trees.
These lasers can easily melt the metal of one of Thanos's ships.
This ship having endured reentry and not being totally destroyed when crash landing with significant force.
Iron Man has a number of different missiles with various power levels.
Here he uses when of his smaller ones on Cull Obsidian.
They can bust holes in Thanos's ship
In this showing he uses a load of them to engulf Thanos.
He even seems capable of creating missiles with his nano tech. As shown here when he creates half a dozen of them to use against Thanos.
Like almost all other suits the Mark L can fly. Here he chases and eventually manages to catch up to a ship leaving the planet.
Iron Man has pretty impressive flight maneuverability.
Here he avoids multiple objects sent at him by Ebony Maw.
He was able to evade around some of Cull Obsidian's hammer strikes.
Here he avoids a few meteors moving at extreme speeds.
Alright I think that's about it. Couldn't find the instance with him healing on YouTube. And I didn't include a speed section because I can't really remember any reaction feats for the Mark 50.
I know I've probably missed some other stuff and some of these gif's aren't the greatest quality but I wanted to get this up today. Hope everyone enjoys it.