Those RS4 seats are sweet. The Up seats don't look sporty, they look about as supportive as the seats in my Kia, which is not at all. If you want to have any fun driving I wouldn't bother
If you like them then buy them. It's your car, you're the one that's going to be sitting in them.
If you're trying to do something that no one has done yet you're not going to get any advice on how to do it. If you want to be first then you have to figure it out yourself.