I don't follow boxing at all, but that ring looked fairly typical, at least not noticeably abnormal. Either way, regardless of ring size, technique was going to win out. Paul was dancing around, but Joshua simply kept pace, wasn't exhausting himself, and stayed within striking distance. Took 6 rounds, but after Paul was OBVIOUSLY dusted, one punch netted him a broken jaw for all his peacocking and showboating. A TikTok video I saw put it perfectly: the fight looked like one between "a professional boxer and a fan." I can talk shit all day about NFL teams I hate, but I know the second I would deign to suit up and play against them, I'd be destroyed. Paul got destroyed, and laughably so. There was a moment in the 5th where Paul bounced himself off the ropes and looked like he was about to pass out; Joshua smiled like a shark licking the blood in the water off his lips. It was the embodiment of schadenfreude for anyone who has tolerated Paul's insufferable ego across all the platforms he has displayed himself on.
And kudos to Anthony Joshua; he clearly wasn't boxing so much as he was letting this "child" live out his fantasy of being a real boxer. I'm sure he didn't mean to break Paul's jaw, but the rest of us ain't mad, not one bit.
EDIT: The grabs at the legs were so pathetic, it wasn't even worth a DQ; the ref let him take the punishment he signed up for. Tough love... or more likely "sincere disdain."