Matthias Fenris
patriarch of the brood..
planetary bodies meaning meteors and satalites. not entire planets. and that giant stone "god" has the sheer mass and size to destroy mountains. and the slow sharge up beam that destroys buildings, isnt limited to just taking out cavilian buildings. and you know just as well as i do that dante has only ever taken two fights seriously, and was letting nero take the heroes credit. (because neros a crazy useless kid)
as for beowulf, you're forgetting hes a demon. in 40k terms, a demon that, with his energy attacks and punches, would equate to another monstrous creature easily with abilities to ignore armour saves. (at the very least)
and the power points on the savior are valid, but at the same time, war titans have been taken down with swarms of nids no more in size than hormagaunts. so their not invulnerable to scything talons and blades. so whos to say dante cant shadow of the collosus his way up a war titans body and take it apart in a similar manner? they may not have alot of weak points like the savior did, but once that energy core is breached, everything around it dies, as well as the titan. so its not outside the bounds of saying he couldnt handle it. hell, cherubael took out a chaos war titan EASILY, and in seconds. and he was defeated and bound by one psychic human, who didnt even have alpha level psyker powers.
and you're still not taking into account dantes demonic power. his sword, along with his fathers and brothers have powers within them to open and seal dimentional rifts. (which, in 40k terms says they can open and close doorways and portals into the warp) as well as project demonic power outward via energy-based attacks. how is that NOT like a powersword? and as for him not being able to pull his own sword out of himself easily, hmm. maybe it would have to do with the size of the blade? oh, and this looks pretty affortless..
http://www.youtube.com/watch?v=p_1kETIVweo
and also ALOT like a powersword.
plus, dante is durable as all hell. hes been stabbed, impaled, blasted and shredded more times than most other creatures. hell, if a space marine took as much hell as he does in any given game, (without his power armour) they would've put him in a dreadnaught.
to reasonably measure the fight, you have to look at it objectively. what can a fex kill? what can kill a fex? what has dante killed. what can kill dante? what weapons and things are in the dmc universe that are similar to the 40k universe and vice versa?
in the 40k universe, dante would be madly hunted by the inquisition as a very deadly threat from the warp. the amount of things he can do is very broken. he has swords which let him shoot thunder out of his hands and create tornados with his body, fire and wind. he can channel demonic powers through them and launch the energy through the air or ground at his enemy. he can create burning meteors of demonic power and hurl it at his enemies, and summon plumes of inferno around him. he has more than one demonic gun that chanels demonic power through it and can bounce and peirce multiple enemies at a time. he has the demonic power to slow down time to a crawl, and an armband that can stop time entirely. he can create a doppleganger of himself to attack his foe for twice the damage. he can move so fast, his body seems to blur and even teleport. and he can push off of demonic platforms in the air the manuever around. not to mention HE CAN FREAKIN FLY. hes kind of OP and more than a bit broken. and you guys arent taking that into account.
hell, im looking at my tyranid codex right now, looking over the fex stats. and the only real thing going for it isnt its "indestructability", but rather its 9 strength value. with a venom cannon means a str 10 hit. which puts it at "IMA ONE SHOT THIS *****!" area. its armour is a 2/3rds protection chance, but theres no real way its going to be able to stop getting hit. being so big and slow (its initiative is at 1, after all), it wouldnt really be able to hit dante. so you're looking at another mundus -type fight. only without all the powers and summons flying around to deal with.