I test drove an S7 as a replacement for my S4. Absolutely LOVED everything about that car. Was waiting for the dealer to get one that had the comfort seats (with the massage function) rather than the sport seats. While waiting, my wife bought a 2018 Sedona SX+. When we went to pick it up, the Kia dealership had a Stinger Limited out front, and after talking to the sales manager about it, we took it for a 1/2 day test drive. I liked the Stinger just as much as the S7! When we got back to the dealership, my wife told me that if I didn't buy it, I was an idiot. 1.9% 5 year financing, 5 year 100K km bumper to bumper warranty. S7=$150K, Stinger=$53,300 out the door. No brainer for me. Have NEVER looked back and absolutely NO regrets whatsoever.
For me, the Stinger Limited is totally on par with the S7, at a third of the price!