Turbo engines typically have soggy throttle response compared to non-turbo cars. It is mostly because of the huge restriction in the exhaust system called the turbine. Not really any way to work around it.
That said, every throttle by wire BMW I've driven had very lazy throttle response compared to my cable-throttle E36 M3. Maybe when you combine the two contributors, bad things happen.
Presumably Josh test drove the 335 and doesn't have an issue with it.
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