So, I've gotten this question a lot. It's just a Ford Fusion blah blah blah.
Truth is, it is not, but therein also lies a bit of the problem.
The 2013 - 2016 MKZ had active suspension, which the Fusion did not. That was the biggest difference, plus no available 305 hp V6. Fords issue, as I see it, is that they've used Lincoln as the "testing" brand recently. They put in the advanced technology and work out the kinks only to apply the tech to the Ford cousins later. The 2016 Fusion now has actuve suspension. Bad move IMO, as the premium brand should always have one big selling point like the active suspension.
That's my personal opinion, hope it's easy to understand. I also want to note the crappy argument that comes with, "it's just a gussied up Ford frame, loom at Lexus (or any other premium arm vehicle)." Oh yes, it does sit on the same bones as a Ford. However, so does Lexus of Toyota, Acura of Honda and Infiniti of Nissan. Look up a Nissan Skyline, then look up an Infiniti G35/37. Look up a Honda Accord, Acura TSX. In some instances, the foreign model is sold as a non-premium brand with a different name, we just don't see that in the states. They sometimes don't even change the body style! Every brand does it, only one brand gets called out for it.