Doomsday has already canonically killed Superman during the DC stand-alone “Superman Vs. Doomsday” comic. Without listing their individual attributes, Doomsday managed to literally beat the man of steel to a bloody pulp, whilst managing to escape unharmed later on.

Superman already fought Doomsday in the comics, it ended in a draw, both dead.
He was the responsible for “death of Superman”.

well we know he beat post crisis.
i would like to see how he fares against pre-crisis and prime.

Doomsday would win. He beat pretty much every superhero on Earth to a pulp before finally meeting Superman, and he wasn’t even tired. Doomsday can fight for days on end without a break and he can pierce Superman’s skin. He has no qualms about collateral damage, meaning he can totally let loose. And, if you read on after Death of Superman, you’d know that Doomsday can jump his consciousness to other objects, so he is impossible to defeat.

you have no idea what doomsday did to superman do you?
they both kept on comeing back over and over and over and over and over and over and over and over and over and over and over and over and over and over and over and over and over and over and over and over and over and over and over and over and over and over and over and over and over and over and over and over and over and over and over and over and over and over and over and over and over and over again superman reigns supream in the end of all the fights.

i read the novel not the comic book of this fight and doomsday beat the crap out of superman without much trouble multiple times so im gonna say doomsday

Doomsday VS Hulk

According to the comics, Doomsday has become completely invulnerable to Superman ever killing him and so, Pre-crisis Superman and Superman Prime would have no way to make a dent in him since while Doomsday is fighting him, he would adapt to all of Pre-crisis/Superman Prime’s speed, strength, and energy attacks. Come on, this fight should have never been created; this just shows how weak Superman is and how the writers and comic fans want Superman to be a “vulnerable human”. When you have Goku pitted against Superman, then all of the Superman fans all of a sudden try to bring out all of these comments like Superman is god and can dodge Goku’s martial art attacks and boxing is better than martial arts/Muhammad Ali is better than Bruce Lee which makes no sense. I have never seen Superman in all of his different versions from comics, cartoons, tv shows, and movies even think of using martial arts with light-speed to overcome an enemy rather than just use strength. The only things about Superman that stand out to me are that he brings out the good in everyone, protects and saves people with power that many of Marvel’s popular characters and other DC Comic’s characters don’t have, a uniform that has bright red, yellow, and blue colors with the best “S” symbol and cape, and last handsome good looks that girls like. Superman doesn’t know how to fight, if he did he would have beaten Doomsday and showed people that he really is Superman. I hate Doomsday killing Superman; he is SUPERMAN isn’t he? To many people and myself, Superman may represent the simplicity of super-strength and inspiration, but past all of that I see the truth about all that Superman is including his weaknesses.

The only good thing about Doomsday is that in the future his genes are spliced with Clark’s to where he develops intelligence and knows right from wrong, plus as a drawback he becomes weaker. He becomes compassionate though and helps the future Superman fight the super-villain Gog and save people. Gog’s power-level rivals both Doomsday himself and Superman. Pre-crisis/Superman Prime couldn’t even beat Gog because Gog held the future Superman prisoner and tortured him for two centuries with kryptonite. There’s definitely something wrong there; Superman is the best super-hero, isn’t he? Doubtful.

It looks like Doomsday’s power-level IS OVER NINE THOUSAAAAAAND!111!!!!111eleven11!

Plus, DC Comics does have power-rating cards that I’ve seen where Superman is ranked 7 out of 8 or 9 which would be like 8 or 9 out of 10 in the Marvel Universe and somewhere between 80,000 and 1 million in the Dragonball Universe.

You guys should really watch Justice League Unlimited. Because in one of the Episodes, the JL squares off with Doomsday, and it seems that he has them beat, until Supes uses his LAZER B33MZ to lobotomize him. It was my first overly violent moment in watching a cartoon. Maybe that’s why they canceled the show.