I wanted to know why Vettel is so good in the wets. I watch the onboard footage of Shanghai Race. I can tell he is always adjusting the steering like Raikkonen in order to feel the available grip as he go around the corner. Unlike Raikkonen, Vettel would deliberately choose to go around in the biggest arc possible to minimise steering angle. another words, he uses minimum brakes and minimum steering.
Raikkonen seems to use the dry racing line with a sharp in and straight out.
Lewis driving style is more aggressive and he seems to flip between the dry lines and wet lines. He tends to be impatient and downshifts early to aid braking. He also don't use the steering to feel the grip.
Button's style seems understeery. He is always looking for the perfect line by approaching a corner with less understeering. thats why he end up pushing long into the straight when Webber overtook him.
I remember Michael Schumacher is always very good in the wets and one of his tricks is that he would use a completely different racing line to go around the track. He has to explore to finds out a new set of lines to drive for the wets.