The Panamera will have a 0-60 around 3.6secs, the P85D is 3.1, so no the Panamera is not close to being as quick as the P85D off the line.Have you ridden in a Panamera Turbo using launch control? It is a really violent experience; it feels like getting hit from behind by a truck.
I haven't driven or even ridden in the Panamera Turbo back-to-back with the P85D, but I have no trouble believing that (using launch control) the Panamera is just as quick or quicker off the line than the Tesla.
The Tesla's instant torque is amazing, but there's no reason to think it will always be faster off the line than every other car out there.