Well I was just asking but There is nothing to be shame about. You actually can't compare a M3 vs RS4 because its not the same class.
M3 vs S4 is the right match.
The reason is because Audi makes two different classes of high performnce cars which is:
1st class: S3 / S4 / S6 / S8
2nd class: RS3 / RS4 / RS6 / Unfortunately there is no RS8 version yet.
I thought since it was silver