Vinyl is superior to leather in every way, and has been for a while now. The thing with leather is that cows haven't changed - they still provide the same skin, which we treat in a certain way and put on our seats.
Vinyl, on the other hand, is man made. 40 years ago, it was pretty sad. 20 years ago, it was getting better, but still far inferior to leather. The thing is, it keeps getting better, while cows are still just cows.
Today, it's not the same at all. Modern Vinyl is tougher than leather, feels better, wears better, survives extreme temperatures better, and, damn it, costs more money. The only place it loses is the social stigma it carries - nobody can get over the fact that this isn't the stuff Gramps had on his Dodge Dart in '68.