I'd expect that there would be some regulations surrounding fire safety but Tesla went so far as to use ceramic and steel for the floor pan. I've never heard of any other vehicle using ceramics to create a firewall. Even just the steel in addition to the ceramic is odd as the rest of the body and chassis is aluminum to save weight. I believe that the firewall is the only large steel plate in the entire car, the only other large steel reinforcement that I'm aware of is the B pillars.

I don't think it's unfair to say that Tesla went above and beyond on their design of the firewall. Even looking at the burned out husks from previous fires, the rest of the body literally melted away yet the floor pan appears to be in one piece. I don't see how you could realistically improve on that and from seeing images of burned out fisker karmas, I think Tesla is doing a better job than their competitors in this regard.