As far as most of us concerned here both cars have positives and negatives and if the engine doesn't matter why is the current C63 engine got more character and better sound than the M3/M4 engine as per most mags, most people that have seen these cars in real life and also what we have all heard on this forum? The car officially is 80kg heavier than the M3 but we cannot call it "fat" until it gets measured by the press/motoring mags. The current C63 is a hoot to drive and i am sure this new version is better and will give the M3/M4 a close run! It will be a great match up when the cars will face each other in the mag comparisons!!Probably not, MB fans have their priorities in bling bling and faux materials in the cabin. The engine doesn't matter, nor the way it drives or how fat it weighs.