Who has the superior ****?!!!
Obviously T'Challa man, BEE-BEE-CEE! BBC aside, Doom SCREAMS overcompensation. Stark too, to some degree. But honestly that's speculation. You can easily say Doom has a horse-**** and is rightfully boastful, or that since Stark sleeps around so much, he's packing something decent at the very least (Ultimate Stark for example alludes that he's packing heat in Ultimates 2). There are too many intepretations if you take everything into account. BP has the BBC meme, but not much canon beyond that, whereas we know Doom and Tony both have insecurity issues. Doom chocked the first gal that wanted to **** him:
And Tony needed alcohol to talk to girls:
Weirdly enough, the only character, AFAIK, confirmed to have a big **** is... Hawkeye.
Morrison has said that Batman has an 11", and it's canon that he can go double digits in a single night, so... Superman obviously has a big one. He's Superman. Wolverine is supposed to be hung, but honestly, he's so short an average **** would look big on him. Then there's this scene about Cyke:
So I guess Cyclops' well-endowed too. I can't think of anybody else.
EDIT: There are these pics of naked Doom & Tony: