Can the old-school Cadillac CT5-V Blackwing stand up against the modern Audi RS7 Performance and the plug-in hybrid BMW M5?

BMW's next special project debut is slated for the upcoming Concorso d'Eleganza Villa d'Este in May.

I was able to round up a small group of the world's best current sporty sedans, including the Cadillac CT4-V Blackwing, BMW ...