I have a 2008 Busa and the torque is something else. I really want to test ride an electric to see how it compares.
Keep in mind that the Busa has gears, which do what (low) gears do: They trade off top speed for torque. In first gear, the Busa has considerably more torque than my 2014 Zero SR, though it probably doesn't have any more than, say, a Lightning.
The real difference with an electric is that it has torque EVERYWHERE, and ALWAYS. Sitting at a stop sign, at 0 rpm, you have 100% torque. Around town at 35 mph, 100% torque. Cruising at 70 on the freeway, 100% torque. If the key is on, and your speed is below 85 mph or so, you have 100% torque. No throttle lag, no clutch to fan, no gearbox to kick down, just roll on and go. It's really not so much about monster torque, it's really about very good torque that's available instantaneously and always. It's the responsiveness of these bikes that really needs to be experienced.