IMHO Mercedes all the way.
About performance, i don't remember where i heared or saw a review about performance, and Z06 was having a performance a bit over some Ferraries, BUT the materials used, the confort, etc was impossible to compare.
I guess this is the main difference when you have to decide which car you want, nowaday most cars have a performance that is above everyones daily needs, so eaither if your car makes it up to 60mph in 6sec or in 5.8 secs it's not a big issue, ir it has 300 or 305HP is the same, if the max speed is 180mph or 190mph, the same, do you really drive that fast? So, i would pay more attention to the confort and the details, and i think in this aspects Mercedes, Ferrari, and other european brands are the best ones.
