Who are the Class 70 contenders?

[MorphyVSFischer]

Ben is quite a bit stronger than Kenshiro, given his whole skyscraper sword feats. Ken really don't wanna get hit by him more than a couple of times.

Ken has regeneration on his side though but that just prolongs the inevitable.

Ken is way to fast for Ben to ever hit, on top of having Intangiblility

[Nik Hasta]

Ken is way to fast for Ben to ever hit, on top of having Intangiblility

Yes? But, as per the OP, this isn't a fight; it's a specific slugfest wherein they take turns hitting each other. In a straight fight, Ken has his speed and a billion more options but this isn't that.

[Shellhead]

ISTR Tony lifting battleships alongside Namor back in the 80s or 90s, but that maaaaay have involved magnetism.

Magnets are curiously powerful in the 616 zipcode.

[The Drunkard Kid]

Magnets are curiously powerful in the 616 zipcode.

I was not able to find the feat with Namor, but I did see an image of Tony casually towing multiple battleships at once while holding onto a bunch of chains, and helping Thor throw an object that he (Stark) claimed weighed several million tons.

[MichaelC]

Stark also flew around carrying a monster the size of a skyscrapper.

[Beadle]

Stark also flew around carrying a monster the size of a skyscrapper.

Yeah, but then Ben Grimm used an actual skyscraper as a sword. That’s just Class 80-ish whackiness.

[Marvel-Studios Rep]

Class 70 Strength
DCEU Superman
CW Supergirl
Hancock
MCU Thor's chargedup hammer strikes
Kratos