Roadster and I are V8 5 users. I don't understand why you want to argue against me on that. I just tell you the fact and you can take these as new data points.
Again, with the electronic assitance (active steering, active roll control), 5 feels sharp then a regular 3 (I drive 335 a lot). And the V8 does not leak on track as you said. Maybe, I am lucky, but it is just the fact.
If you think Audi is better than you 5, just get a Audi; why spend the time complian about 5. If I am in your mindset, I will switch to Audi in no time.