2024 Kia K5 vs 2025 Mazda MAZDA3

The 2024 Kia K5, particularly in the GT-Line trim, was a head-turner on Southern California roads. Its Passion Red Tint Coat drew admiration from passers-by, though many were unfamiliar with the K5 name, which replaced the Optima in 2021. Despite some inexpensive-looking plastic in the cabin, the interior design was praised for its metallic trim and refined transmission shifter. The K5 GT-Line offered a sporty look and a reasonable price, though it lacked the high-end quality found in more expensive models.

In contrast, the 2025 Mazda MAZDA3 Hatchback boasted an organically shaped design with a long hood and tapered greenhouse. Its Polymetal Gray paint and red leather interior created a striking appearance. The interior was driver-focused, with high-quality materials and a calming atmosphere. However, the gloss black plastic trim showed wear easily. The Mazda 3's design was both elegant and practical, though some found its proportions odd from certain angles.

The 2024 Kia K5 offered a turbocharged 1.6-liter four-cylinder engine with 180 horsepower and 195 lb-ft of torque, paired with an eight-speed automatic transmission. The GT model featured a more powerful 2.4-liter engine with 290 horsepower and 311 lb-ft of torque. The K5 GT-Line, while sporty in appearance, was more fuel-efficient, with an EPA rating of 31 mpg combined. However, real-world testing showed lower fuel efficiency, averaging 24.5 mpg. The K5 GT-Line's suspension provided a comfortable ride, though its brakes were not ideal for aggressive driving.

The 2025 Mazda MAZDA3 came with a 2.5-liter four-cylinder engine producing 191 horsepower and 186 lb-ft of torque. The turbocharged version offered up to 250 horsepower and 320 lb-ft of torque with premium gas. The Mazda 3's standard engine was smooth and refined, and the manual transmission option provided an engaging driving experience. The car averaged 29.1 mpg in testing, close to its EPA rating. Mazda's G-Vectoring Control Plus enhanced handling, though the torsion-beam rear suspension could be unsettled by sharp bumps.

The Kia K5 provided ample comfort and utility, with a 10-way power driver’s seat and generous legroom. The GT-Line trim featured SynTex leather and cloth seats, though the material could be sticky. The panoramic sunroof added a touch of luxury, but taller passengers might find headroom lacking. The K5 offered 16 cubic feet of cargo space, with convenient trunk access.

The Mazda 3 felt compact, with snug seating and limited stretch-out room. The eight-way power-adjustable driver’s seat and red leather upholstery added comfort. Visibility was generally good, though the reversing camera lacked guidance lines. Rear-seat legroom was tight, and storage space was limited. The cargo area offered 20.1 cubic feet, accommodating full-size suitcases and carry-ons.

The Kia K5 featured an 8-inch or 10.25-inch touchscreen infotainment system, with Apple CarPlay and Android Auto. The larger display included navigation, SiriusXM, and Kia Connect services. A wireless charging pad and optional Bose audio system enhanced the tech experience, though voice recognition was less reliable.

Mazda's Connect infotainment system, with an 8.8-inch or 10.25-inch display, required physical controls for most functions. Apple CarPlay and Android Auto were available, though a USB-C cable was needed for connectivity. The 12-speaker Bose audio system provided excellent sound, and additional features included Wi-Fi hotspot access and Mazda Connected Services.

The 2024 Kia K5 came with Kia Drive Wise, offering features like forward collision warning, automatic emergency braking, and lane-keeping assistance. It received high marks from NHTSA but lower scores in updated IIHS tests. The Highway Driving Assist system was praised for its performance, though it had room for improvement.

The 2025 Mazda MAZDA3 excelled in safety, earning a "Top Safety Pick+" from IIHS and five stars from NHTSA. Standard features included forward collision warning, lane departure warning, and blind-spot monitoring. The adaptive cruise control was smooth, though lane departure alerts were sometimes inaccurate.