Mercedes-Benz GLC300 vs Audi Q5

What's the difference?

The GLC300 Coupe isn't quite as great when it comes to being a family car as the regular SUV version of the GLC, and that's purely down to the sloping roofline which not only makes access more difficult to the second row but reduces boot capacity.

That said, the GLC300 Coupe makes a much better family car than a Mercedes-Benz C-Class sedan, or any sedan.

Easy and enjoyable to drive, packed with great features and still practical, the GLC300 Coupe would still cut it as a good family car.

The updated Audi Q5 Sportback TFSI is a strong example of a luxury base-grade SUV, ticking most of the boxes in styling, comfort and features. It may not always outperform its rivals on paper, but it delivers where it counts, offering a refined, practical and engaging package that will satisfy.

Coupe SUVs aren’t for everybody… they’re not even for lots of people. But the design of an SUV with its roof cut down so that it meets the tailgate at an almost sportscar-like angle appeals to more than a few fans. The thing is they don’t just like the look, they love it, and they also probably enjoy how much the styling makes other people cranky.

To my eyes the GLC300 Coupe is the best execution of the bodystyle compared to those of BMW and Audi. There’s an elegance to the GLC300 Coupe and the AMG-line adds a tough look that only enhances the solid, powerful but pretty look.

The GLC Coupe is a mid-sized SUV and this new generation model is a bit bigger the previous one and now measures 31mm longer at 4763mm end to end, it’s 1890mm wide, 1605mm tall and has a wheelbase of 2888mm.

It’s also more aerodynamic than ever. No seriously, it’s drag coefficient is now 0.27 and it looks like a bar of soap - and it's about as slippery as one, too.

More curved surfaces await inside with a dashboard that pours down into the large centre console and it's adorned with a sloping and large portrait-style media screen. 

At night or in tunnels the ambient lighting glows through the air vents and skirts the edges of the door trims, console and dashboard.

It’s a minimalist and high-tech cockpit with modern sports seats up front and a Nappa leather wrapped steering wheel with its twin blade design.  

So, how does the coupe design work for family practicality? Let’s take a look.

The Q5 Sportback is the more attractive sibling when compared to the standard SUV, with a shape that feels more dynamic and sport-oriented. The updated design dials back the sharper creases of the previous model in favour of softer curves, paired with slim matrix LED headlights. The revised 'Singleframe' grille has strong presence and the full-width rear light treatment adds to the Sportback’s visual appeal. Overall, it’s a very handsome vehicle.

Inside, the interior glow-up is immediately noticeable. The large new display takes centre stage in a redesigned dashboard that looks clean and appropriately sophisticated. 

There’s a good mix of materials throughout the cabin, including the beige leather upholstery, although the presence of hard plastics reminds you that this is still a base grade. Even so, the cabin largely hits the right notes for a luxury entry point.

There are a few details that don’t quite land for me. The door-mounted control panel on the driver's side feels busy and a little fiddly to use, and creates an oddly sized and positioned pull handle that just doesn’t feel nice to use. And this is very much a nitpick, but the black stitching on the beige seatbelts catches my eye all the time. None of these are deal-breakers, but they stand out in an otherwise well resolved interior.

SUVs are the most practical cars for families because of the better access to the cabin thanks to their large doors and slightly elevated ride height, their big boots with wide and tall hatch openings and their high flat rooflines. They’re essentially raised station wagons.

A coupe-style SUV still has four doors but they are less boxy due to the sloping roofline which falls away quickly to meet the tailgate at a lower point. The effect is a sporty-looking shape but practicality is lost in this exercise of form over function.

The second row doorways aren’t as large as those on the regular SUV. I did a side-by-side test and felt like I had to duck under the sloping roof when getting out of the back seat.

The smaller opening also made it trickier to lift my toddler daughter into her baby seat.

The sidesteps are also surprisingly handy for bigger kids and my eight-year-old used them every time when climbing into the car.

Cabin storage is outstanding with huge door pockets and cupholders in both rows, and while the 545-litre boot in the GLC300 Coupe is 80 litres smaller than the cargo capacity of the regular GLC SUV, it's bigger than the previous version of the Coupe.

As for people space, there’s enough headroom for me at 189cm tall in the back seat and heaps of legroom, even behind my driving position.

I’ve mentioned the lack of climate control in the second row, but also should point out that there are no USB ports back there either.

There are USB ports in the big centre console box upfront and a long cord should be able to make it to the second row. 

There’s a wireless phone charger but it's housed in the bowels of the centre console too, and you’ll need to weave your hand while clasping the phone under the shiny black trapdoor, past the cupholders possibly with drinks in them and almost under the dashboard.

Up front, the cabin feels spacious and comfortable, with plush (heated) electric seats, while the driver also benefits from a two-position memory function, which is a plus if the car is shared. My main gripe is the short seat bases, which become noticeable on longer drives.

In the rear, comfort largely holds up, though space is better suited to two adults due to the high transmission tunnel. The 40/20/40 split-folding rear seat is a practical inclusion and helps when juggling passengers and longer items.

Storage is mostly well considered. There’s a generously sized glove box and a couple of useful storage bins in each door, although the centre console is on the smaller side. The dedicated phone tray is a highlight, housing the wireless charging pad, two USB-C ports and a 12-volt socket. Both rows get cupholders and bottle storage, while rear passengers also benefit from USB-C ports, climate control, directional air vents and map pockets. Overall, there’s just enough space and amenity for adults or teens to remain comfortable.

Technology is handled by the updated media display, which features a responsive touchscreen and a menu system that’s easy enough to navigate. Wireless Apple CarPlay and Android Auto are quick to set up, and the built-in satellite navigation is clearly laid out. That said, the near-total absence of physical buttons may frustrate some, with functions like climate control buried within the touchscreen. The number of pop-up disclaimers on start-up also feels excessive.

Boot space is where the Sportback’s sloping roofline has the biggest impact. Load height is limited, and capacity tops out at 515L with all seats in place, making it the smallest in its segment, albeit only by around 10L. I like the deep underfloor storage, along with the cargo cover, net and hands-free powered tailgate. However, the lack of a spare tyre, replaced by a repair kit, is a deal-breaker for me as a country driver, though it may matter less to those with easier access to repair services.

The Audi Q5 Sportback is offered with a choice of petrol or diesel engines, across two grades before stepping up to the more powerful SQ5 variants. For this review, we’re testing the base petrol TFSI grade, which is also the only front-wheel drive option in the line-up.

It carries a before on-road costs price of $84,500 and comes well stocked with features that often sit on the options list with key rivals. Aside from the Genesis GV70 2.5T, which remains hard to beat for standard inclusions, the Q5 Sportback TFSI stands out as one of the better value propositions at this price point.

New for this update is a large panoramic display that combines an 11.9-inch digital instrument cluster with a 14.5-inch central media screen. The system includes built-in satellite navigation, wireless Apple CarPlay and Android Auto and access to the 'Audi Connect' app. The app allows access to remote services like locking/unlocking to car, checking fuel/charge levels, sending navigation routes, car finder and monitoring vehicle status (warnings, last parked location).

Our test car is fitted with optional 'Pearl Beige' leather upholstery, which is a no-cost option. New design elements include a full suite of LED exterior lights, including matrix LED headlights and side puddle lamps.

Comfort is clearly a priority in this grade, with electric and heated front seats featuring lumbar support and a two-position memory function for the driver. Three-zone climate control, a wireless charging pad, multiple USB-C ports and 12-volt sockets, along with a 360-degree camera system round out the major tech highlights.

Practical touches haven’t been overlooked either, with a hands-free powered tailgate, cargo cover and net plus a 40/20/40 split-fold rear seat set-up.

The GLC300 Coupe has a 2.0-litre four-cylinder turbo-petrol engine making 190kW of power and 400Nm of torque.

There’s also an overboost function which allows the engine to make an extra 17kW and 200Nm just for a brief moment, but that extra dollop of grunt combined with the regular output provides impressive acceleration (0-100km/h in about 6.3 seconds) for overtaking or moving quickly when you need to.

A smooth nine-speed automatic transmission sends the drive to all-four wheels.

The GLC300 Coupe is all-wheel drive and while there’s a setting for rougher terrain, along with one for comfort, eco and sport, but I’d make sure that it doesn’t get any more adventurous than tame gravel and dirt roads.

Mercedes-Benz refers to the GLC300 Coupe as a mild hybrid and this is because it has a 48-volt system and an integrated starter-generator.

This type of hybrid doesn’t use electric motors, doesn’t drive the wheels and won’t save much fuel, but it will provide efficiencies by supporting the engine and when coasting, plus will reduce petrol consumption to a small degree.

The Q5 Sportback TFSI is front-wheel drive and powered by a 2.0L four-cylinder turbo-petrol engine paired with a mild-hybrid system. Combined outputs sit at 150kW and 340Nm, which places it toward the lower end of the segment when stacked against rivals such as the Genesis GV70 2.5T and Mercedes GLC300 Coupe offering 224kW/422Nm and 190kW/400Nm, respectively.

On the road, however, there’s still plenty on offer for everyday driving, with power delivery feeling smooth and accessible. The seven-speed transmission shifts effortlessly, helping the Q5 Sportback feel refined and easy to live with, even if outright performance isn’t its headline feature.

As we mentioned above the GLC300 Coupe's 48-volt mild hybrid system is not the kind of hybrid that will allow you to drive miles on electric power, nor will it dramatically reduce fuel consumption in the way a parallel, series or plug-in hybrid will. But every bit of efficiency helps.

Mercedes-Benz says the GLC300 Coupe will use 7.7L/100km after a combination of open and urban roads. 

We had the GLC300 Coupe for just two days, but in that time my family covered 176km of regular daily usage which took in motorways but mainly suburban duties such as the school run, supermarket dashes, that sort of thing.

In our fuel test we measured 14.48 litres at the fuel pump which works out to be an on-test fuel use figure of 8.2L/100km and not far off the manufacturer’s claim. 

While this fuel consumption isn’t overly high, a plug-in hybrid or even a parallel or series hybrid could return about 5.0L/100km or less.

Mercedes-Benz has dropped plug-in hybrids from its Australian range which is a shame because it would be good to see more efficient options in the GLC range. Of course if you want more efficiency from a Benz of the same size, there is always the fully electric EQB or EQC.

The Q5 Sportback TFSI has a claimed combined (urban/extra-urban) cycle fuel consumption figure of 5.7L/100km and paired with its 65L fuel tank offers a theoretical driving range of up to 1140km. An impressive result on paper.

After a mix of long highway driving and my usual urban runaround, real-world consumption settled at 5.8L/100km, which is almost spot on.

It also highlights the Q5 Sportback TFSI’s performance/efficiency trade-off. While its outputs are modest relative to some rivals it rewards you with excellent economy in real-world use.

There’s a lot to like here but the short version is the GLC300 Coupe has a comfortable ride, but good handling, with a responsive engine, although rear visibility through the small back window is poor.

If we drill down a bit further I can tell you that excellent cameras around the car will help you check to make sure kids aren’t running around behind you and that forward and side visibility through the window is good.

An important takeaway is that the GLC300 Coupe is easy to drive with light steering and an engine that’s mild and controlled in its power delivery.

The gear shifter is mounted on the steering column, in the same way an indicator lever is. So putting the car into Drive, Reverse and Park is so easy and means you don’t have to take your hands off the steering wheel. 

As a family car I liked the good body control and composed ride. We have a small toddler that we can sometimes only get to sleep by taking her for a drive and we found that she could nod off and not be woken by potholes and speed bumps or too much leaning in the corners. 

There’s enough power in the base grade to keep things engaging on the open road, whether overtaking or maintaining pace, with a reassuring sense of reserves and smooth, punctual delivery.

Despite the firmer suspension, ride comfort remains high thanks to the newly tuned damping system, which absorbs bumps without sacrificing road feedback. The cabin is quiet at speed and at low speeds the car can switch to its hybrid system for extra refinement.

I’m not a huge fan of the adaptive steering assist, particularly on winding roads, as it can overcorrect at times. Overall, though, the Q5 Sportback delivers enjoyable, sporty dynamics.

Visibility is good from the front and sides, while the rear window is a little on the small side. It’s easy to get accustomed to the car’s dimensions and a clear 360-degree camera view comes standard across all grades, providing a clear view that automatically activates during low-speed manoeuvres. Parking this car is straightforward and stress-free.

The Audi Q5 Sportback carries a fresh maximum five-star ANCAP safety rating from 2025 testing. It comes with nine airbags, including side-chest airbags for both rows which is a standout feature, as these are often limited to the front seats.

The safety equipment suite is strong, featuring lane departure warning, lane keeping assist, side exit warning, blind-spot monitoring, traffic sign recognition, dusk-sensing LED headlights and emergency call capability. There’s also front collision warning, rear cross-traffic alert with assist and rear turn-assist. Adaptive cruise control is generally well-calibrated, though it can occasionally slow for vehicles outside your lane.

Autonomous emergency braking covers cars, pedestrians, cyclists, motorcyclists, and backover assist which is operational between 5.0 and 250km/h. Child safety is supported with two ISOFIX mounts and three top-tether anchor points, although only two seats fit comfortably.

The GLC300 is covered by Mercedes-Benz's five-year, unlimited-kilometre warranty. 

Services are annually or every 25,000km. And you can buy a three-year service plan for about $3000.

The Q5 Sportback comes with Audi’s five-year/unlimited km warranty, which also includes complimentary roadside assistance - all fairly standard at this end of the market. A five-year pre-paid servicing plan is available for $3520, which is cheaper than the pay-as-you-go option, though it’s not the most competitive compared with some rivals. For instance, BMW offers the same coverage for $2475, while the Genesis comes with complimentary servicing.

You can also extend the service period by two years with the 'Audi Advantage Package' for an additional cost. Services are spaced at sensible intervals, every 12 months or 15,000km, whichever comes first, making maintenance straightforward and predictable.