Roomy, sleek compact sedan with upscale features at an approachable price across all trims.
Punchy 1.6L turbo engine delivers fun, but dulled by a slow-reacting 8-speed automatic transmission.
Strong value, but rivals like the Jetta GLI offer sharper performance and more engaging drivetrains.

The compact car once ruled Canadian roads, serving as the starter vehicle for millions and anchoring automaker lineups with sheer sales volume. Fast forward to 2025, and most manufacturers have either retreated from the segment or kept things on cruise control. But then there’s Kia. Rather than simply retooling the Forte, they’ve cleaned the slate entirely and dropped the all-new 2025 Kia K4, a sedan that tries to make compacts relevant again, with mixed results.

2025 Kia K4 GT-Line | Photo: Matt St-Pierre

Now, I’ve got some history with Kia. One of my first press vehicles back in late 1998 was a Sephia, the K4’s not-so-glorious great-great ancestor. Since then, we’ve had the Spectra and Forte, but Kia, being Kia, they didn’t just evolve the Forte, they erased it and went full send with the K4.

Unique K4

The version I spent time with was the GT-Line, which is as sporty as it gets for now. Think of it as Kia’s take on a Civic SI or a Jetta GLI. The design grabs attention as the car’s low, wide, and looks far bigger than your typical compact. There’s a reason for that: the K4 is only 15 cm shorter than the old Optima (now K5), and it’s nearly as wide. Park it next to older midsize sedans and you’ll barely see a size difference.

From some angles, the K4 is striking. From others… not so much. The C-pillar glass design is awkward, and the rear door handles, hidden in the trim, initially confused my kids. The rear glass treatment with a plastic filler panel feels like it’s trying too hard. Honestly, the upcoming hatchback looks like it will solve a lot of these design quirks.

Inside, things get better. The dual 12.3-inch screens, heated front and rear seats, and premium-looking steering wheel lend a surprisingly upscale vibe. But that white insert on the steering wheel? Already imagining how grubby that’s going to get after a few Tim Hortons runs. The materials are generally good, but I don’t understand why there’s no storage pocket on the back of one of the front seats—lazy omission.

Rear seat space is generous, and the 413 litres of trunk volume is excellent for the class. Visibility isn’t great, though.

GT-Light

The real headline for the K4 GT-Line is the 1.6L turbocharged four-cylinder, good for 190 horsepower and 195 lb-ft of torque. On paper, that’s strong. In practice, it pulls confidently and even sounds decent on a cold start. Natural Resources Canada says it’ll return 8.0 L/100 km, I averaged closer to 9.2, which is fine for a zippy compact.

Handling is another high point. The suspension tuning is surprisingly refined—firm without being harsh, even on Montreal’s famously cratered roads. It’s no corner carver, but it delivers confidence enough to have some fun.

But—and it’s a big one—the 8-speed automatic transmission is the K4 GT-Line’s Achilles’ heel. Around town, throttle response is laggy. On throttle, the car hesitates, unsure of what gear to pick, and only really wakes up in Sport mode, and even then, not impressively so. At times, it reminds me of a poorly tuned dual-clutch transmission when it’s just a conventional automatic. For a car billed as sporty, that’s a letdown.

Contrast that with the Volkswagen Jetta GLI, which for $500 more (in Canada) gives you a 228-hp engine and the option of either a proper six-speed manual or a slick well-tuned seven-speed dual-clutch. In many regards, the Jetta comes out ahead in driver engagement.

Ok value

As for pricing, the Canadian-spec K4 starts at $23,995 for the base LX trim, which is well-equipped with heated seats, remote start, Apple CarPlay, and Android Auto. The GT-Line starts at $31,495, and my tester with the $3,000 Limited Package rang in at $34,495. For that, you get 18-inch black wheels, upgraded driver aids, and a Harman Kardon sound system, all of which honestly isn’t worth the extra coin.

Ultimately, the 2025 Kia K4 GT-Line is a bold swing in a shrinking segment. It nails the look, offers reasonable value, and brings real personality to the compact sedan space. But it’s held back by a transmission that doesn’t keep up with its sporty pretensions. If Kia wants to truly rival the Jetta GLI or Civic SI, it needs either a sharper gearbox or, dare I say it, a manual option.

Until then, this is a stylish, well-equipped compact with just enough punch to entertain, but not enough polish to dethrone the best in class. Still, it’s worth a look—just know that the drive isn’t quite as spicy as the badge might suggest.