Audi RS7 vs Mercedes CLS 63 AMG Is A Rather Balanced Match-Up - Carscoops (blog)

With similar power outputs and similar torque figures, these two cars should match each other blow for blow on the drag strip. If you're racing in an Audi RS7 , your best bet is to rely on its quattro all-wheel drive system in order to get off the line faster than your opponent. The problem is, the RS7 weighs around 2 full tons, or 4,420 lbs. This is where this particular version of the CLS 63 AMG comes in. It has the Performance Package, yet no 4MATIC all-wheel drive system, which means that it's 135 kg (297 lbs) lighter than the RS7. Plus, we're looking at a rolling start so the RS7... Source: www.carscoops.com