I really wish Kia would release this with more HP AND AWD, not either/or like the K5. I don't understand why with such nice cars (Cadenza/K900 and this) that they don't offer more HP to compete in that next level class. Even just the 350HP/TQ available with the current tune on the 3.5TT engine would be a help. I'm sure they could retune it for more power and drop that in. Even 400HP/TQ brings it into true BMW/Audi/Merc territory for a performance sedan. The rest of the car already stands on its own against those offerings.
They could save money by offering this with the Stinger drivetrains. Use the same platform but stretch it a bit for the K8, or just move the 2nd row back some to prioritize legroom over trunk space. But then I suppose it would step on the toes of the Genesis G80.
I owned Subarus for a number of years, and my old '05 Legacy GT was one of the most fun cars I've owned. It was a WRX for grown-ups: 2.5 Turbo, 5-spd manual, AWD w/ 50/50 torque split. With a simple ECU tune it went from 250 hp/250 ft-lbs to over 300 for both.
Having owned my Cadenza now for almost 3 years, I've experienced the limitations of FWD. Make it AWD, with more supportive seats, and I'd be quite happy.
If the K5 GT could be had with AWD, I'd gravitate there, but I guess the Stinger is the only option left for AWD & performance in the same package (in the US). (or, if I have to, move to Genesis)