I saw this a while ago, makes the sur-ron look pretty fun. I was looking at the KTM too but didn't see bike weight listed on their website. If it was substantially lighter than a gas moto it might be worth it. But the battery only lasts 90min and it is $3600 for a spare?
The nice thing with the sur-ron is it is much lighter at 50kg. I don't take my moto on singletrack because I'm paranoid of dropping in somewhere I can't get out of, or tipping it down a side slope and not being able to get it back on the trail. Can't just pick it up and hike a bike out like with my mountain bike. The sur-ron would be a little more like the MTB weight wise. That said, it's fucking ugly.
https://www.youtube.com/watch?v=u6DzZK7UpNE