This was a very interesting UNBIASED comparison of the Q50 and Stinger. It seems the Stinger drove a little more like a luxury car, the Infiniti was a little more sporty. But the Stinger was Significantly faster. 4.6 to 60 vs 5.3 in the Infiniti. Which are almost red sport numbers for Q50s prices.
Also Infiniti interior quality was only marginally better. They had an equal amount of cheap plastics but Infiniti made their car seem slightly higher quality per interior design choices.
From his review, i gather Kia has to give this car a more defined identity. I think the Genesis G70 will do that much better. What's interesting is, I heard the G70 will be noticeably faster than the Stinger, while on the same chassis and engine/power. I'm guessing the transmission choice and suspension?
https://youtu.be/XCmuKu5n7Og