As a current owner of a sportish 2015
KIA Forte Turbo, based off my limited exposure and experience with the Stinger, below are the following reasons why I am leaning towards the Q50. Don't get me wrong, the Stinger is a good car and a fresh breathe of air. However, as I tend to keep my cars forever, therefore I have a very stringent selection criteria and a very particular eye for vehicles.
Primary Considerations,
*Interior Design (I'm not a fan of pop up displays and more importantly the stinger lacks a premium design. It just doesn't look plush, whereas the Q50 feels like you are cocooned in wrap-around luxury. The Stinger interior feels extremely cold and sterile by comparison)
*Interior Quality (No comparison here - The Q50 interior is typical Japanese luxury which means high quality surfaces and a very comfortable and plush cabin that will age well and hold up incredibly well over time, in 10yrs time the Q50 interior will still look and feel nice, I can assure everyone here the same cannot be said for the Stinger)
* Paint Quality (Stinger's paint job looks dull even in the showroom, and all the premature wear and tear the owners are experiencing with the paint reaffirms this view. There was a red stinger in the showroom and It just didn't gloss, sparkle and pop out like the way it should with a car of this class. Instead the paint gave the Stinger a very dull "plastic" look)
* Longevity (The Infiniti is a tried and proven formulae and the Japanese produce cars with the best drivetrains, engine and overall longevity and they're generally easy to work on)
*Age (The Q50 will age more gracefully inside and out than the Stinger)
Below are my secondary considerations,
*Compromise (I have driven plenty of cars, and every time I compare the Camry/Accord to Optima/Sonata, or
Forte/Elantra to Corolla/Civic the former brands always drive better, I'm talking about power delivery, overall road holdings and balance. I clearly feel with Koreans - the overall ride and handling are always too compromised, either it's too hard and sporty or too floaty. There is no balance, this may impress the reviewers who spend 2 hours with the car, but for someone who will be living with the cars for years to come, it's not good. It's the same with power, the Koreans have a tendancy to overrate their power and the delivery of power is not smooth like the way Japanese vehicles - i.e transmission, throttle calibration, shift points, power management etc etc)
At the end of the day a vehicle is made up of thousands of different components and it's fair to say the Japanese have mastered the art of making all those components work in harmony to produce a more satisfying end product for the driver.