I just think the 32, 33 and 34 are more pure than the latest, Im not saying there not good cause they are but they just arnt for me, I do love the M5 tho, never driven the latest but drove plenty of the V10s and the V8 M3's although im not a BMW fan either but its hard not to like an M model, the first gen M135 is an awesome bit of kit handles amazing.
same instance if i was given the choice to own a Veyron or F1 road car, it'd be the F1 every time its pure not silly computers making the driver look good, if you don't have the skill to drive it you wont be for very long, F1 road car is the greatest of all time imo