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The 2021 Kia K5 mid-size sedan is here, officially putting the Optima name to rest in the US market. Adopting a badge used in the global market for years, the K5 not only gets a new moniker, but a whole raft of new-to-Kia technologies, including an all-turbo powertrain lineup, available all-wheel drive, and an optional eight-speed dual-clutch transmission. Those features help the 2021 Kia K5 distinguish itself from the closely related Hyundai Sonata, giving it a more aggressive mien than its gracefully mod
