Im gonna be real generous in MArv's favor (love his character). He gets a tough fight with Nite owl and rorch and barely win. Reason I say barely because imo the watchmen displayed better fighting skills. The strength is comparable Marve might be overall stronger than Rorch but Roch was quick and he could take a beating to.
Comedian is just as strong as marv if not stronger. His fighting skills were significatn even despite being really old (can't judge on his younger version because he didn't do anything. In his slightly younger form when he was beating on a bunch of rioters was nothing marv couldn't do) His fight with Ozy was impressive and I must assume he is faster and stronger in his younger days. Marv loses to Comedian.
Ozy is just too damn quick and strong. Ozy aint gonna get hit but he is gonna be beating the crap outta Marv for a while due to how much damage the man can take. But Marv won't be landing shit.