For years, Cadillac V cars were a curiosity. Hotrod performance from the luxury brand was unexpected fun. But the Cadillac CT5 V-Series Blackwing is another best-in-class performer and it’s lofty performance is no longer an anomaly. It begs the question- Is Cadillac a better performance brand than a luxury marque? How does it compare to the CT4 V Blackwing? Does it compete with Audi RS5, BMW M5, Alfa Romeo Giulia Qudrafoglio, and Mercedes AMG C 63 S? Tom Voelk answers those questions and more. He checks out a well-optioned CT5 V Blackwing in Metallic Rift paint equipped with a 6-speed manual.