So old pantheon was an obnoxious lane bully with very little to offer to his team outside of his ult -
New pantheon is still a lane bully, but he has to land his abilities at least, or the enemy has to play into them.
I think the amount of utility new pantheon provides play with a jungler and top laner duo, the ability to dive is beyond ridiculous -Though I don't know how exactly they would sort of the crazy coordinated play they've given pantheon.