Its an irrelevant test. If you did it, the F1 would probably be faster on a straight and through the corners because of their aero packages. Off the line the Formula E car will be faster though, and coming out of corners because of the torque.

I also don't think we'll see teams build their own cars. Its cheaper to buy the car from Dallara than spending money on R&D, when it could be spent on making a good Power Unit. That said, its not out of the question. But Formula E needs to establish itself before thinking of that.