Which South Korean mid-size car is one of the Nissan Altima's largest competitors?
Nissan Altima:  The Nissan Altima mainly competes against cars such as Chevrolet's Malibu, Ford's Fusion, Honda's Accord, Hyundai's Sonata, Mazda's Mazda6, Subaru's Legacy, Kia's Optima, Toyota's Camry and Volkswagen's Passat. Hyundai Sonata: The Hyundai Sonata (Korean: 현대 쏘나타 ) is a mid-size car produced by the South Korean manufacturer Hyundai since 1985.
Hyundai Sonata