2026 Audi A6 vs 2025 Kia K4

The 2025 Kia K4 was a compelling choice for younger buyers or those seeking a second car, offering affordability and low running costs. Despite the rising transaction prices of new cars, the K4's starting price of $26,956 made it an attractive option. The sedan's design was sleeker than its predecessor, the Forte, with a fastback silhouette and upscale features like amber daytime running lights and aggressive wheel designs. Inside, the K4's interior was adorned with plastic, but it was competitive within its segment. The K4 was available in five trim levels, with standard features including a 12.3-inch touchscreen display and USB-C ports. The GT-Line trims offered additional comfort with lumbar adjustments for the driver's seat.

The 2026 Audi A6, while not as visually striking as some competitors, featured a lower "singleframe" grille and fender flares inspired by the Quattro rally car. Its LED headlights had a pixelated effect with programmable signatures, and the taillights were repositioned to accommodate programmable lights. The A6 was available in base, Progressiv, and Technik trims, with an S Line Black package for the Technik trim. The interior materials were somewhat disappointing, with a prevalence of tinny plastic. The A6's design was more subdued than the Mercedes-Benz E-Class, and it offered a stable and composed driving experience, better suited for highway cruising than spirited driving.

The 2025 Kia K4, in its non-Turbo trims, was powered by a 2.0-litre naturally aspirated four-cylinder engine producing 147 horsepower and 132 pound-feet of torque, paired with a continuously variable transmission (CVT). All K4 models were front-wheel drive. While the specifications were comparable to the base Honda Civic, the K4 lacked the engaging driving experience of its rival. The GT-Line Turbo trims featured a 1.6-litre turbocharged engine with 190 horsepower and 195 pound-feet of torque, mated to an eight-speed automatic transmission. The Turbo models offered improved performance, but the steering remained numb. The K4's fuel economy was rated at 8.4 L/100 km city, 6.0 highway, and 7.3 combined for the 2.0-litre engine, and 9.2 L/100 km city, 6.6 highway, and 8.0 combined for the turbo.

The 2026 Audi A6 was equipped with a turbocharged 3.0-litre V6 engine, delivering 362 horsepower and 406 pound-feet of torque, paired with a seven-speed dual-clutch transmission and standard quattro all-wheel drive. This engine was shared with the S5 sedan and provided impressive acceleration, with a 0-100 km/h time of 4.8 seconds. The A6's handling was enhanced by brake-based torque vectoring and an optional Sport Plus package, which included a sport rear differential and rear-axle steering. However, the Sport Plus package's steel-spring suspension compromised ride quality. The A6's steering system offered precision but felt artificially heavy in Dynamic mode. Overall, the A6 excelled in highway stability but was less suited for dynamic driving.

The 2025 Kia K4 maximized its compact sedan proportions, offering 413 litres of trunk space, just shy of the Civic's 419 litres. Rear passengers enjoyed 964 millimetres of legroom, matched only by the Hyundai Elantra. The seats were comfortable, with SynTex upholstery, and the adjustable cupholders were a practical touch. The K4 was a practical choice for those valuing spacious rear seats and cargo capacity.

The 2026 Audi A6, while six centimetres longer than its predecessor, maintained the same wheelbase, resulting in no significant increase in passenger space. The panoramic glass roof added front-seat headroom, but rear-seat dimensions remained similar. The A6 offered comparable space to the BMW 5 Series, with heated rear seats and climate controls. The trunk provided 382 litres of cargo space, more than a CT5 or E-Class but less than the 5 Series. The A6's interior was comfortable, with sport seats offering a balance of bolstering and cushioning.

The 2025 Kia K4's GT-Line trims featured a wireless charging pad, four USB-C ports, and wireless phone projection. The navigation system included Google Points of Interest search, reducing reliance on smartphone apps. The GT-Line Turbo Limited boasted a Harman Kardon audio system.

The 2026 Audi A6 introduced the Digital Stage setup, with an 11.9-inch digital instrument cluster and a 14.5-inch touchscreen. An optional 10.9-inch front-passenger touchscreen was available. The MMI infotainment system had oversimplified layouts, but voice recognition and wireless Apple CarPlay and Android Auto were standard. An interface update was planned for mid-year, adding features like an integrated dashcam. The optional Bang & Olufsen 3D audio system featured headrest speakers for navigation directions.

The 2025 Kia K4 received a Top Safety Pick+ rating from the IIHS. Standard safety features included lane-keeping assist, forward collision warning, and adaptive cruise control. Optional features included blind-spot warning and Highway Drive Assist 2 for semi-autonomous driving.

The 2026 Audi A6 came with standard driver-assist features like adaptive cruise control, forward collision warning, and lane departure warning. However, it lacked a hands-free driving system, and the lane centring feature allowed for some lane wobble. Crash-test ratings were not available at the time of writing.