In the late 80's F1 cars were 1.5litre Turbo and a one time 1400bhp in qualifing ! Just complete animals you just can't imagine pressing the throttle with NO traction control.
Great story above about Senna and Brundle in F3 by laurance they had a great battle. Very fitting they both won their firstborn World Championship in the same year!
Senna's in F1 and Brundle in World Group C Sportscars
Brundle was an amazing driver, but he lacked that 'thing' that made Senna SO great. remember Martin in a Benneton at Spa, Schumacher went off in the wet and rejoined behind his team-mate (MB) and spotted how his car was working better on different tyres, so came in and switched. Also, watch Brundle at Monaco (can't recall what year - think he was in a Tyrell), one of the few drivers to overtake regularly there.
Martin did very well in Sportscars - that was an incredible era for that category - Walkinshaw's Jaguars taking on Porsche and then Mercedes joining in (Schumacher was in the squad). Again, beasts of cars, no real limits, just get to the finish on fuel allocation - turbo vs normally aspirated.
Brundle and Senna are a good comparison, in many ways. Both amazing drivers, but one had that bit extra. Martin was fast, but he was driving the car, Ayrton was driving WITH the car. He once spoke about being in an out of body state during qualifying, where he was just ahead of his actual position - already done with that corner and onto the next bit of track.
i do feel sorry for F1 fans today who never saw him drive and wonder what the big deal is. He had it all, skill, speed, looks and charisma - my, he was THE big deal.