This was the '80s when even "exotic" cars weren't particularly great. These cars often used Detroit Big Three-made transmissions. Their V8s and V12s were usually underpowered. Even a Buick GNX and a Ford RS200 Evo were hardly beaten by the flagship exotic supercars.
This, the Jaguar XJS V12, and the Porsche 928 are some of the greatest grand tourers ever made. I also like the Aston Martin V8 Vantage, but the interior was very low quality for a high-end luxury brand.