Zero SR/F electric motorcycle

Chance meet in Fulham, West London, with a demonstration Zero SR/F electric motorcycle, which is quick enough to out-accelerate a Porsche 911, allegedly.
Just sitting on it, taking care of the charging cable plugged between the rider’s legs, gave an impression of the low centre of gravity and the long wheelbase.
Range from a full charge said to be about the same as a sportsbike for comparable performance.
Said to be silent, I wonder what the Harley E-bike will sound like on the street: the Moto-E track bikes have just an eerie whine of the drive train.