Since I've never had a tight pussy, it would be hard to compare. All the women I've fucked, including my three wives, were fucked enough before I got to them, and by guys with bigger cocks than mine, so that they were loose by then.
But, interestingly enough, my present wife, who has been fucked by more guys than she can remember, does a better job of grabbing my dick with her cunt muscles than any of the others. She says her first husband, the guy who has fucked her the most, did have a fat prick, and that is really what loosened her up.