It's a nicely appointed large executive sedan — a fitting flagship for Cadillac.

Of the non-plug-in CT6, in my review I said:

[T]he CT6 is a great combination of cruiser and sort of sport sedan. In Tour mode, it's relatively muted, but in Sport mode, it perks up. You can flip the paddles yourself, but I stayed with automatic for the most part and enjoyed the fact that I was in a sharp-handling, large sedan that didn't toss me around. The CT6 is no beast — although this Premium Luxury trim level can do a claimed 0-60 mph in just over five seconds — but the torque-y twin-turbo V6 does a very good imitation of beefier V8.

Honestly, the plugin CT6 errs more on the side of being a comfy cruiser, with a focus on fuel economy. The turbo four banger, even with the electric boost, won't make you think you have a V8 hiding under the hood.