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About K4 and K5

The K4 and K5 are Kia's sedans, carrying the flag for traditional cars in a lineup increasingly dominated by SUVs. The K4 is a compact sedan and hatchback aimed at first-time buyers, commuters and budget-conscious families, while the K5 is a midsize sedan with sleek, fastback-like styling and a sporty GT version. Both have bold, angular designs that set them apart from more conservative rivals, and both offer generous features and Kia's long warranty.

The K5 began life as the Optima, which Kia sold in the US from the early 2000s. Kia adopted the K5 name, already used in Korea, for the redesigned car that arrived in 2020, and its long, low styling, distinctive lighting and available turbocharged engines quickly won praise. The K4 arrived for the 2025 model year to replace the Forte, bringing a dramatic new design, a large widescreen dashboard and a turbocharged GT-Line version. A hatchback followed, and Kia has since given the K4 a hybrid version in some markets.

The K4 competes with the Honda Civic, Toyota Corolla, Hyundai Elantra, Mazda3, Nissan Sentra and Subaru Impreza, while the K5 faces the Toyota Camry, Honda Accord, Hyundai Sonata and Nissan Altima. Their strengths include style, features and value; critics have noted that the K4's driving dynamics do not match its sharp looks and that the K5 faces a shrinking midsize-sedan market, which has led many rivals to exit the segment entirely.

Coverage includes reviews of the K4 sedan, hatchback and hybrid, as well as the K5, pricing and trim news, comparisons with rivals and recall notices. Because the page covers both cars, you will find stories about both, along with reports from markets such as Vietnam, where the K5 is reviewed and sold. Watch for news about the future of Kia's sedans as the brand balances its lineup between cars, SUVs and electric vehicles.