It's my favorite color, it's the color I always planned on using if I found another XF that may need a paint job.
IMO, there's no way it's factory.
If the car was a coupe, and a 6 spd. I'd be all over it.
But on 2nd. thought, it seems I remember seeing a photo of a coupe that looked very similar to it somewhere on the web a while back. At the time I just dismissed it as being red with bad lighting. But it was a bright sunny day just like the photo of the roadster.