I was lucky enough to have a passenger ride with Emerson Fittipaldi around Brands Hatch at a manufacturers test day, about 30 years ago.
He drove round tyres squealing, not talking, concentrating heavily, bumping edges of kerbs, engine revving freely, it was one hell of a lap.
About an hour later I got a ride with Niki Lauda in the same car. He chatted throughout, a nice calm quiet drive round, really showing interest in chatting about his racing career, the crash, and all sorts, it was a great time and he was very happy to chat and drive.
At the end of the day we got lap times from all our drives, and to my complete surprise, the time from when Niki was driving, was almost 1 second faster than when Emerson drove.
Truly showed what a league above everyone else he was as a driver.
RIP Niki a true legend, the world will be a far poorer place without you.