While your comparison has merit when implemented correctly the new 8 speeds out class the transmissions they replace by leaps and bounds. I can relate direct experience with the SRT transmissions in the Jeep SRT8. I had a 2012 with the Mercedes sourced NAG1 transmission and while not the most sophisticated it is and was considered a very good box. Enter the 2014's with the 8 speed ZF, the vehicle is transformed. On the track the quick shifts and closer gearing keeps the vehicle in the power band without upsetting the car when shifting, something that can't be said of the NAG1. Shifts are immediate and rev matching simply works. Around town the gear changes are virtually unnoticeable unless you are in sport or track mode. While I was perfectly happy with the 2012 I realized after 20 minutes in the 2014 that it was a markedly better vehicle. The same will be said of the C7 with the A8, mark my words.My GF has a BMW 328i with the 8 speed auto. I have an X1 35i with the six speed auto. I really don't like her 8 speed. Damn thing is upshifting and hunting all the time. Not so with the 6 speed in my X1. My C-7 is an auto and I've already been between 29-31 MPG in Eco, when I can contain the 18 yr old inside me. A six speed auto suits me just fine. If I wanted more MPG I'd drive a Hugo!