As I was saying in the E vs Superb thread, a BMW will always be several steps above a Ford. This applies to other brands. No matter how good the M6 drives, if I have the money, give me the Ferrari F12 instead, please.
The M6 is not even remotely in the same league as an F12, so not sure what point you're making. Sure, the E and Superb are quite far apart in terms of materials, image etc. But it's possible to compare them, at least to see how close the Superb can get in terms of desirability/price to the E-Class, even if it doesn't actually get there. That is not the same with the M6 and F12, however.