ok; i would like to make some corrections. Lets use a powerful being from dc planet. Superman for example. Now lets get some of superman enemies and pit them against one of the weakest dbz character. Lets say krillin. Lets start with equus, someone who sliced superman up. lets pit him against krillin. Krillin speed blitz him, winking out around his body, punching him with 1000 punches per second and end it with a destructo disk to the head.
Krillin vs kalibak; Kalibak is more durable but i do think that krillin punches would affect him and once krillin sees that kalibak dont want to fall, he winks out under him at blinding speed, grabs him by the feat, throw him ini the sky and shoot a moon destroying blast at him desintegrating him.
Krillin vs mongel; Krillin gets tired of mongel talking and punch him in the face and while staggering, winks out behind him and split him in half with a destructo disk.
Honestly; there shouldnt be anyone below galactus in dc or marvel that should pose a threat against anything in the caliber of tien on up. Master roshi, one of the weakest dbz destroyed a moon with little effort. Master roshi and goku as a child did an entire fight seen that would have lasted 10 minutes if a human did it but they did it in milliseconds.
Dragonball z fighting speed is so rediculous that it cannot be copied by any dc or marvel character. By the way it has been classified many of times that a lot of the dbz characters have enough power to destroy a universe. Why would they do it, why would cell do it. Was he trying to kill himself. Lets put it like this, brolly destroyed a galaxy without much effort. That should tell you something.
Power wise.
Goku>>Vegita>>gohun>>Tien>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>Thanos>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>Superman
Buu would destroy thanos. Thnos is a bad a** and is one of the most powerful beings out there but i cannot see anything below galactus even posing a threat.