Owning these 2 beasts, E92M3 & F10M5, these are 2 different kind of beast.
The M3 are light, agile and high revving. The power can really be unleashed at around 5500 rpm. It is very fast and easier to tame. The high revving engine is very addictive especially with the Akra.
The M5 are heavier but the higher torque allow it to climb the speed faster than M3, on paper its 0 to century about 0.2 sec faster than the M3. The power will be unleashed earlier than the M3, at around 1500 rpm. It is very fast but U need to learn to tame it properly then U will be happy driving it. That's why I could understand why the M5 was totalled during the media session.
In my opinion, the new M6 will combined these two M's character giving it the 'ULTIMATE DRIVING MACHINE'...
Warmest regards.