Mark88,
Not to be rude, but you don't know what you don't know. Optima/Sonata are sisters under and in some measure in the skin. Cadenza/Azera are as well. Rio/Accent,
Forte/ElantraVeloster has a Kia twin although not as sharp a roof line, nor three doors. Genesis and Kia K9 (not here yet) are as well. The SUVs share the components within and exterior shells. The Equis and Genesis coupe are unique to Hyundai in the US. With the exception of the upscale product, the cars are the same as well the SUVs.
Badge engineering, very well done, but
badge engineering none the less . Whom could they have learned it from...Ford, GM, Chrysler, Toyota, Nissan ,Honda come to mind.