The Kia Stinger GT is remarkably nearly as fast as a Mustang GT... seriously, is Ford even trying? When a Hyundai is nipping at your heals, it's effing time to pump some iron and get a bit more muscle

Car and Driver has tested both, and found that the Kia pulls a 12.9 1/4 mile.
They found the Mustang was a 12.6.

Then they had both in a drag race and the Kia won. Of course, that's somewhat down to racing experience and ability of the drivers... but, it shows a clear lack of dominant ability by the Ford.

http://www.thedrive.com/watch-this/19329/turns-out-the-kia-stinger-gt-can-beat-a-ford-mustang-gt-in-a-drag-race