As a UK Stinger GTS (GT2 / Limited in the US / Canada) owner, I am one of the very few.  I have only seen three or four others in the wild!  
But, that gives Stinger owners here a rarity factor.  People are always asking me about the car or just staring!  “What’s that... wow, it’s a 
Kia!!” 
BMW 4 Series Grand Coupés and Audi A5 / S5 Sportbacks are absolutely everywhere and, as such, very boring.....as well as being inferior and overly-priced products 
Also, the lack of Stingers may help owners’ residual values.  Not that this will overly concern me, as mine is a long-term keeper.  What would I replace it with??!