Styling changes are subtle, but the redesigned 2017 Cadenza features an all-new body structure. Given that it shares the bones of the new Optima, Kia's promise of more responsive handling is plausible. The new car is slightly wider and lower, with a longer wheelbase, adding up to about a half-inch more rear-seat leg room. The 290-hp, 3.3-liter V6 is similar to the engine in the Sorento SUV, which we found slick. We got 22 mpg with the previous car's V6. Inside, Kia has upped the comfort level, with increased soft-touch bits, real stitching on the dashboard, and available Nappa leather seats. The driver's seat can even rotate for easier cabin access. Automatic emergency braking, adaptive cruise control, and lane-departure warning will be available, an omission on the outgoing model.