This is a difficult question. If you do want to have your electricity from solar,wind and nuclear Power Plants the Model S has an advantage.
Still, the Panamera Hybrid combines the advantages of both an electric and a gasoline engine. It's a sustainable car, because the small battery can be replaced or recycled.
I think the Tesla's monster battery is a different animal on that regard. If you do look through these forum, degradation is already an issue.
That is not true but that is expected. The Tesla pack can be recycled as well. There has not been a degradation issue either. Good effort though.