If you want to see Senna's footwork at close quarters, here's some on-board footage of the great man driving a Honda NSX road-car on the same track. Bear in mind that the gear-lever is on the wrong side for him and he's wearing his loafers! Despite that, he's got the thing on the ragged edge for the whole lap.
Brilliant to see him stabbing at the throttle way before the apex of the corners which was characteristic of his driving style. None of the other drivers did this
https://www.youtube.com/watch?v=JUVkVB3SUf4