Actually, the pick up of the 730Li is quite modest - in the old E65 I drove, the best I ever timed was about 7-8 secs from 0 - 100km/h (me, wifey & mother-in-law in the car), and mind you, the E65 is the short wheel base version & is lighter than the present F02 (long wheel base).
However, ONCE they've picked up speed, my goodness, those things are like a homing missile. I've ever driven from Singapore to KL (started very early, at about 430am, cleared Tuas customs & Sultan Abu Bakar Complex by about 5am, and reached KL city fringes 2.5 hours later. That's an average speed of about 130km/h, which doesn't sound very impressive, until you consider that we took toilet breaks & there were occasions where I had to cut down on speed (e.g. approaching toll booths & overhead bridges) - so, to catch up on the 130km/h average, I definitely would have to floor the car in a big way.
And it's pretty impressive to think that even at 220km/h, the E65 is rock-solid steady, and never wavered from the piloted course.
Once my F02 is fully run in, I'm making another cannonball run up north heheheh