As for the Kia Stinger, I don't think it will do very well. Not only because the market has shifted towards CUV/SUVs nowadays, but also I don't think folks will care for another expensive Kia sedan (see Cadenza and K900 sales). I hardly even see their other sedans on the road (see tons of Hyundais though).
I see Optimas here pretty often, so I predict Stinger will sell well too.
Optimas have taken over BMWs in the "knob" segment so I expect the RWD Stinger to do especially well.