2018 Kia Optima vs 2022 Mazda MX-5

What's the difference?

If you travel long distances, want a good amount of space and don’t want to pay big bucks for a new car, then yeah, maybe there is a reason sedans like this will hang around for a while longer.

Sure, the appeal of sedans mightn’t be as strong as it once was, but models like the Kia Optima prove they still have a reason to exist.

Well, Mazda has gone and done it again – it's managed to make the MX-5 even better.

It's easy to be cynical about the real-world impact of Kinetic Posture Control, but it does actually make a meaningful difference, building upon an already class-leading drive experience.

Needless to say, if you're in the market for a new mainstream sports car, the MX-5 is still the default option. I'll take a manual RF GT, thanks.

Note: CarsGuide attended this event as a guest of the manufacturer, with meals provided.

Cosmetic changes for the facelifted 2018 Kia Optima include new headlights and tail-lights with revised LED signatures (but still halogen lamps in the base model), and there are newly sculpted bumpers and new wheel designs across the two-model range. 

We had the base model Si, which doesn’t look as good as the GT model, because it has smaller wheels, the sporty body kit and misses out on the LED headlights, but the LED daytime running lights are still present.

The GT has a more aggressive look, and the side skirts, front spoiler and rear diffuser fit it better - there are dual exhausts, but not sporty quad exhaust tips.

In fact, this model is a bit like the old-man version of the Optima. No offence intended to old men, of course. The GT is just heaps sportier, and I reckon it’s considerably more attractive as a result. 

Still, the inherent sleek styling of the Optima remains - the chrome highlighting along the window line is a bit too sheeny for me, but the angles and stance of this model are quite gracious. I really dig the fact the top of the windscreen mirrors the ‘Tiger Nose’ grille shape.

I'm no exterior designer, but I liked the existing Optima more - it just looked a bit neater, even though it had a decent amount of bling with its Mercedes-like diamond-pattern grille, as opposed to the cheese grater look seen here.

There’s not quite as much bling inside the cabin of the Si, either, but it is still a well-designed space - just not as special as the premium package offering of the GT (which gets leather trim - not nappa leather, but still a quality cowhide finish, and more). Check out our interior photos to see if you agree - but size and interior dimensions of the Optima are hard to argue against.

I'll be honest, when the ND MX-5 was unveiled, I did not love it. In fact, I had question marks over whether it had an angle that looked good. But over time, I've realised that it was me who was off the mark.

Yep, the fourth-generation model's exterior design is ageing gracefully, with those pinched headlights and that gaping grille looking fabulous. And the front end is made  stronger by the pronounced fenders, a design flourish also seen at the rear.

Speaking of the back end, it's still not my favourite angle, but  the correct paintwork selection can make it pop in all the right ways. Yes, those wedge-circle-combination tail-lights are not for everyone, but they are an undeniable signature.

As mentioned, the MX-5 range is available in two body-styles: the traditional, manually operated soft-top Roadster and the more modern power-operated hardtop RF. Of course, the former is quicker to use, while the latter is more secure.

Either way, the ND is starting to show its age inside, where its basic design (including physical climate controls) is headlined by a ‘floating' 7.0-inch central touchscreen – which can be operated via a rotary controller – and a small, multifunction display next to the traditional tachometer and speedometer.

Again, there's not a lot to it, but leather upholstery adorns the steering wheel, gear selector, manual handbrake and dashboard insert, and there are body-colour accents on the door shoulders. The GT and GT RS also get cow hide on the seats, and that's your lot. I must admit, I actually love the ‘back to basics' interior approach.

I really like the way Kia designs its cabins. Sure, there’s a lot of black in here, but there’s also a lot of thought put into the usability of the space.  

The high-mounted 7.0-inch infotainment and multimedia touch screen in the Si is simple to use, and for 2018 the Optima range gets Apple CarPlay and Android Auto - you couldn’t get that in the Optima up to this point. 

Also included are a reversing camera, USB input, Bluetooth phone and audio streaming and six speakers. The Si model misses out on sat nav - you’ll have to use the maps app on your phone. No DVD player either.

Storage is well thought out in here, with big bottle holders in the doors, a good sized pair of cup holders up front, and a nice little storage bin for your phone, wallet, keys and so on.

There’s a driver info screen with a digital speedo, and even on this base model you get a dual-zone climate control air conditioner. The updated Optima gets a new steering wheel, too.

Now, what about the back seat?

It may be considered a ‘mid-sized’ sedan, but there’s limo-like space. With the driver’s seat in my position (I’m about six feet tall) there was still heaps of rear legroom in the rear seat, with ample knee room, good foot room and decent shoulder space, too - three of me could slot across the back bench comfortably, which means kids will fit easily, too. There are three top-tether points and two ISOFIX points as well.

Kids and adults alike will be happy with the rear air vents back here, and there’s a flip down armrest with cupholders, too. Again, big bottle holders appear in the doors, and there are map pockets in the back seats.

What about boot space? With so many people choosing SUVs over sedans because they’re theoretically more practical, the Optima offers good food for thought - it has enough luggage capacity for a bunch of suitcases (510 litres VDA in size) and there’s a full-size alloy spare under the boot floor. If you need more, you could always invest in a roof rack setup?

Measuring 3915mm long (with a 2310mm wheelbase), 1735mm wide and 1230-1235mm tall, the MX-5 is a petite sports car, so needless to say, practicality is not one of its strengths.

For example, the Roadster version's boot has a tiny cargo capacity of 130L, while its RF sibling has 127L. Either way, once you put two soft bags or a small suitcase in it, there's not much room left. And let's not forget the very tall load lip that you need to contend with.

The MX-5 doesn't exactly offer more inside, as the central storage bin is puny, and the glovebox is basically non-existent, alongside tiny door bins. Aside from the decently sized ‘ski port', it's not great news for in-cabin storage.

That said, two removable but shallow cupholders are located between the seats, but they're propped by flimsy arms, which can cause anxiety, especially with hot coffees and the like.

Connectivity-wise, there's a single USB-A port and one 12V power outlet – that's it. Both are found in the centre stack, near a cubby that's appropriate for smartphones.

It's  worth mentioning the MX-5 doesn't have anchorage points for child seats, be they top-tether or ISOFIX, so it's a sports car for adults – obviously.

For that reason, you expect some shortcomings on the practicality front, and these ones are not dealbreakers when driving alone.

For MY22, the MX-5 is still available in two body-styles: the soft-top Roadster and the hardtop RF. It also keeps its three grades, including the unnamed entry-level offering, mid-range GT and flagship GT RS, but pricing is up by $400-1700 for every variant.

In terms of specification changes, Platinum Quartz is a new metallic paintwork option, while the RF GT can now be had with Terracotta Nappa leather upholstery. Aside from Kinetic Posture Control and some key safety upgrades for the unnamed entry-level grade – which we'll explore in later sections of this review – that's the extent of the MY22 adjustments to the MX-5 line-up.

Standard equipment in the  entry-level grade, therefore, includes dusk-sensing LED lights, rain-sensing wipers, black 17-inch alloy wheels, push-button start, a 7.0-inch touchscreen multimedia system, satellite navigation, wireless Apple CarPlay and wired Android Auto support, digital radio, a six-speaker sound system, single-zone climate control, an auto-dimming rearview mirror and black cloth upholstery.

The GT adds adaptive headlights, silver 17-inch alloy wheels, heated side mirrors, keyless entry, a 203W Bose sound system with nine speakers, heated seats, an auto-dimming rearview mirror, black leather upholstery and stainless-steel scuff plates.

For $1020, a Black Roof package can be added to the two RF GT variants, which bundles in – you guessed it – a black roof and Pure White or Terracotta Nappa leather upholstery.

The GT RS gets several performance-focused upgrades over the GT, including Gunmetal Grey 17-inch BBS forged alloy wheels, Brembo front brakes package (four-piston calipers and high-performance pads), Bilstein gas-pressurised dampers and a solid alloy strut tower brace.

When it comes to similarly priced rivals, the MX-5 doesn't have many, with the Mini Cooper S Convertible (from $51,530) coming the closest, while the just-launched Subaru BRZ (from $38,990) and yet-to-be-priced Toyota GR86 twins aren't far off.

The Si model is powered by a 2.4-litre four-cylinder petrol engine, which has seen no changes to its specifications for this mid-life update.

Engine specs remain at 138kW of power at 6000rpm, while torque is rated at 241Nm at 4000rpm. It makes use of a six-speed automatic transmission only - there’s no manual transmission here, but you do get paddle shifters - and it's front wheel drive (the Optima isn't available with AWD, or as a 4x4, or in rear wheel drive - the latter is left to its bigger brother, the Stinger).

The GT gets a zestier drivetrain with more horsepower - it has a 2.0-litre turbo four-cylinder engine with 180kW/350Nm, which is much more desirable, but also louder than the Si’s 2.4. It also has a six-speed auto transmission, and is FWD. If you're into ratings and statistics, that 2.0-litre with a turbocharger is one of the perkier offerings for its engine size in the class.

There is no hybrid model available, despite a plug in hybrid petrol version (allowing you to run in EV mode) being sold in European markets. No diesel here, either, while other markets get a 1.7-litre turbo diesel. No LPG model here, or anywhere else, for that matter.

Towing capacity for Optima models is 750kg unbraked and 1700kg braked for the 2.4-litre, and 700kg/1400kg for the 2.0-litre turbo. Tow bar down-weight is capped at 80kg.

If you're concerned about engine problems, suspension problems, clutch and transmission issues, be sure to check out our Kia Optima problems page.

Prior to MY22, the Roadster's entry-level grade was motivated by a delightful 1.5-litre naturally aspirated petrol four-cylinder engine that produced a modest 97kW of power at 7000rpm and 152Nm of torque at 4500rpm – but that option is no more, due to slow sales.

That's right; pour one out for the enthusiasts, as all MX-5 variants now use the familiar 2.0-litre unit that develops a more formidable 135kW at 7000rpm and 205Nm at 4000rpm.

That said, drive is still sent to the rear wheels via a six-speed manual with a rear limited-slip differential, or a six-speed torque-converter automatic with paddle-shifters. However, the GT RS is the only grade that exclusively comes with the former.

Kia claims a very realistic fuel economy rating of 8.3 litres per 100 kilometres for the Si model, and we saw damn close to that consumption during our week of testing. On the highway it will sit at around 6.5L/100km, ensuring good mileage, while city driving will push usage above 12.0L/100km. Our overall average was 8.5L/100km, which is good. Use the eco mode, and you'll get a little better use.

The turbocharged GT model uses a little more, according to Kia’s 8.5L/100km combined average claim, but we guarantee you’ll actually use more than that because it’s more eager to please.

Fuel tank capacity is 70 litres - plenty of size for long distance drives.

The MX-5's fuel consumption on the combined-cycle test (ADR 81/02) varies from variant to variant, with manual Roadsters managing 6.8L/100km, while their automatic counterparts require 7.0L/100km. Three-pedal RFs need 6.9L/100km, while two-pedal versions drink 7.2L/100km.

That's a strong set of claims for a sports car, and while I wasn't able to get a real-world result for the MY22 version due to the nature of its launch program, my previous experience with a MY21 manual Roadster saw an average around its claim, which is impressive stuff.

For reference, the MX-5 has a 45L fuel tank that takes more expensive 95 RON premium petrol at minimum, with claimed driving range, therefore, in the 625-662km region.

The Optima has some really good elements to the way it drives, but sadly  some less impressive bits as well.

Let’s start with the not-so-great stuff - the 2.4-litre engine in this Si model just isn’t as enjoyable as the turbo unit, and the fact that Kia still doesn’t offer a hybrid version here, despite doing so elsewhere, is a bit of a downer.

The drivetrain isn’t terrible - the six-speed auto is smart enough, and there’s usable power if you boot it. The two more sedate drive modes, 'Eco' and 'Comfort', mean the transmission will aim to save fuel and limit throttle response, with a bit more of a lazy feel to the drive experience. But in 'Sport' mode it is definitely more rewarding in terms of acceleration and performance, offering a bit more pep and urgency (we didn't do a 0-100 km/h speed test, but take our word for it); it undoubtedly at the cost of fuel consumption.

It’s just a bit of a shame Kia doesn’t offer the turbo in this spec, too. Fuel use for the Si model is better than the turbo, however, so it could be ideal for buyers who are more worried about the bottom line than design and a sportier drive.

The thing I like most about the Optima is its road manners - the steering and suspension have been tuned for local conditions, just like all Kia products, and it shows. 

The electric power steering is really well sorted, making for easy parking moves and good assuredness at higher speeds. And the turning circle is decent, too - 10.9m (so, the turning radius is 5.45m). 

Plus the ride comfort is really good. On the highway it coasts along with very little fuss, and around town it deals with lumps and bumps impressively. Sharp edges can upset things a tad, and mid-corner bumps can make it jitterbug a little bit, but not to a degree that would rule it out of contention if you want a mid-sized sedan.

It’s pretty quiet on the open road, too, and the adaptive cruise control makes long-distance driving a simple task. The GT does suffer a little bit more road noise, though.

Let's get straight to the elephant in the room: Kinetic Posture Control. What is KPC? Well, put simply, it uses its electronic smarts to apply brake pressure to the inside rear wheel – when necessary – while cornering, all in the name of improved body control.

So, does KPC actually make a meaningful difference? We tested MY22 MX-5s back-to-back with MY21 versions on-track and on-road to find out, and the short answer is yes.

The GT RS makes better use of KPC due to its sporty chassis upgrades, delivering a more confident drive when cornering hard, but the softer unnamed entry-level grade and GT still benefit from its influence.

Either way, the upshot is how these upgrades make the MX-5 even flatter through the corners. It almost doesn't matter how hard you turn in; it will remain relatively locked down. And given the already graceful way in which it pivots, there are next to no handling issues.

Otherwise, this is the same MX-5 we've come to know and love, which is great news for drivers that, you know, like to drive.

The electric power steering defies convention with its well-judged weighting and high level of feel. It's not the hydraulic system of previous generation, but it's great in its own right.

And the MX-5's suspension set-up (double-wishbone front and multi-link rear axles) still delivers a ride that's not for everyone, especially the jittery GT RS that, again, has Bilstein gas-pressurised dampers and a solid alloy strut tower brace.

The 2.0-litre naturally aspirated four-cylinder engine is still very enjoyable, with its free-revving nature egging the driver on to push towards the redline with every upshift, and with peak power (135kW) produced at a scintillating 7000rpm, you feel obliged to.

This unit is naturally short on torque, particularly down low, and its maximum (205Nm) is developed at 4000rpm, so the driver has to work the right pedal hard, which they'll be willing to do because of the fun factor.

Of course, the key to this memorable experience is the six-speed manual. It ticks nearly all the boxes with its perfectly weighted clutch, short throw and well-judged ratios.

The six-speed torque-converter automatic also does the trick with its smooth shifts, but it doesn't seem that keen to hit the redline, even when the Sport drive mode is engaged and the accelerator pedal is buried. I would pick the three-pedal set-up without hesitation.

Critically, braking performance is strong alongside pedal feel, but the GT RS makes both better with its aforementioned Brembo  brakes package.

Now, it'd be remiss of me to not touch on the MX-5's noise levels, as it's not the most peaceful sports car on the market. Naturally, the Roadster is the most disruptive body-style, with the RF providing better insulation. Keep that in mind if it's important to you.

While Australia's independent automotive safety authority, ANCAP, awarded the MX-5 its maximum five-star safety rating in 2016, the game has changed significantly in the past six years, so keep that in mind if it's on your shopping list.

Either way, advanced driver-assist systems in the MX-5 extend to front autonomous emergency braking (AEB) with pedestrian detection, cruise control, traffic-sign recognition, blind-spot monitoring, rear cross-traffic alert, a reversing camera and tyre-pressure monitoring.

In a good move, new to the unnamed entry-level grade for MY22 – but already standard in the GT and GT RS – are lane-departure warning, driver-attention alert, rear AEB, and rear parking sensors.

That said, lane-keep and steering assist should also be part of the range-wide package alongside adaptive cruise control, but they're looking like they won't be a factor until the next-generation MX-5 – if there is one.

Other range-wide standard safety equipment includes four airbags (dual front and side), anti-skid brakes (ABS) and the usual electronic traction and stability-control systems.

Kia remains a shining light in terms of its new-car-ownership promise, with a very strong seven-year/unlimited kilometre warranty. It makes a lot of sense if you plan to hang onto the car for a while. There's no extended warranty available, which is understandable.

That plan also includes a roadside-assist plan for the same seven-year period, provided you maintain your car with Kia Australia. So, given you get one year to start with, then you get an extra year of cover every time you go back to Kia to get your car serviced, you could end up with eight years of coverage. Nice!

Servicing is due every 12 months or 15,000km, with the first seven years covered by a capped-price-service cost / maintenance cost plan. The costs are: service one - $289; two - $466; three - $360; four - $559; five - $325; six - $599; seven - $345. That makes a total cost of $2943, which is competitive for its class. Keep your owners manual or logbook up to date, and your resale value should hold up better.

If you have concerns about common problems, issues, reliability ratings and durability, you should check out our Kia Optima problems page.

Like all Mazda Australia models, the MX-5 comes with a five-year/unlimited-kilometre warranty and five years of roadside assistance, both of which are average when compared to Kia's market-leading seven-year terms with ‘no strings attached'.

Service intervals for the MX-5 are 12 months or 10,000km (whichever comes first), with the distance on the shorter side. But capped-price servicing is available for the first five visits, costing $1755 in total, or an average of $351, which is not too bad.