I think you overestimate the importance of the EPA rating for a worldwide vehicle (Europeans really don't care about the EPA for ex). The reviews are overwhelmingly positive and full of superlatives - this is the true "high end electric car" to beat now. Yes Tesla might tweak the Model S to make it a bit faster, and it's significantly cheaper, but it also feels significantly cheaper to sit in and drive, and it's unlikely to magically improve tomorrow because Porsche has had decades of refining those qualities.