I think the axing of the K900 / Cadenza is an acknowledgment, tacit or otherwise, by Kia that it
isn't geared to be a luxury brand. I don't consider the Stinger to be a luxury car . . . even at the GT2 trim level. Rather I see it as a high performance grand touring sedan. My guess is the bulk of us here bought the Stinger because it gives the most performance bang for the buck, whether at the GT Line level or at the GT/GT1/GT2 level. Looking at the GT, from a price perspective, the comps are the Audi A5 Sportback and the BMW 430i Gran Coupe, and neither gives the performance that the Stinger does. And from a performance perspective the comps are the S5 Sportback and the 440i Gran Coupe, and those are both going to be around $10,000 more.
There's also a certain dealer experience that comes with a true luxury car and luxury brand. The BMW and Audi dealerships are going to offer nicer accoutrements than a Kia dealership . . . plain and simple. One of the local Euro car dealers here has an espresso machine. They'll also provide loaner cars for non warranty work, and their loaner cars aren't on the level of the
Forte or the Optima, because they don't have cars on the level of the
Forte or the Optima.
Corvette could - and should - become its own separate GM brand. And it would be easy, because the trim levels within the Corvette model have their own names - Stingray, Grand Sport, etc. The Hellcat moniker is interesting, because technically it's just a trim level (i.e. the official name of the car is the Charger SRT Hellcat). They could switch it around, though, and make Hellcat the "brand" such that owners would have, for example, a Hellcat Charger. But the name would still be diluted because of the lower, Dodge-based trim levels. Regardless, the Stinger doesn't have that. It's a vehicle model, and the trim levels don't really have their own names. Which isn't to say that Kia couldn't do it either. Genesis started out in 2008 as a vehicle model - the Hyundai Genesis - and came in coupe and sedan form. It wasn't until 2017 that it came out as a separate and distinct brand. Kia could do the same thing with the Stinger, but that likely won't be for a while.