15. Kia Optima/K5 (vs. Hyundai Sonata)
The rivalry between Kia and Hyundai plays out with the Optima—now called the K5—constantly seeking to upstage its corporate sibling, the Sonata. Kia pushes the envelope with bold styling, sportier trims, and value-packed features, always trying to one-up Hyundai’s offering.
This friendly competition results in two midsize sedans that keep getting better, as each brand strives for a slight edge in design or tech to capture more buyers.
Sibling rivalry never looked so stylish. U.S. News & World Report