Getting the new 2015 Z06 in the garage, exciting and wonderful....having it with the new A8 8 speed paddle shifter (2.95!!)....priceless! 
Correction ^WOW! Better than anticipated. A real affordable 10 second car from the factory!
You got that right! Even in my C6 Z06, with "only" (LOL) 505 HP/470 TQ, could spin the tires without even trying to 80 MPH. Realize the C7 Z's rears are one size wider, are better rubber, and the car has eLSD, but judicious application of the throttle will always be key...Thinking getting the tires hooked will be the primary limiting factor/challenge for most real-world users.
Although the pedal is still to the floor, wouldn't torque management et al dial back the engine's output during the shift?I believe 1st gear in the A8 is around 4.56:1 and even with the, I believe 2.41:1 rear gears it's likely it'll be going through 2nd gear at 60.... Gear changes with the automatic won't matter as much because there won't be any break in power during the shifts. Not sure about the 7-speed manual and how far out you can stretch 1st gear.