I had an MKZ 3.7 loaner for 3 days and test drove an MKC 2.0 both black on black. For me, the current MKZ interior (which I like) comes of as modern yet sterile while the MKC has more dimension. They are similarly styled but the C has a more "crafted" interior - if that's the right word. The open pore wood & metal trim curves not just in plan but in section, too. It feels and looks more expensive but that might be due to the upgraded leather. The Z door panels have no detail where the C has extra stitching. The Z also benefits from having less sparkly flat black plastic on the console. Both are an upgrade from the '10 MKS. I've decided to wait for the '16 MKZ before making a decision on my next car.