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Hyundai IONIQ 9 vs Mercedes SL Class comparison

Compare performance (428 HP vs 816 HP), boot space and price (59,900 £ vs 112,700 £ ) at a glance. Find out which car is the better choice for you – Hyundai IONIQ 9 or Mercedes SL Class?

Hyundai IONIQ 9 vs Mercedes SL Class: Key differences

Hyundai IONIQ 9

  • substantially cheaper
  • substantially more electric range
  • clearly more trunk space
details

Mercedes SL Class

  • substantially more power
  • substantially quicker 0–100 km/h
  • considerably lighter
details

By Achim Sedelmaier

Here’s where it gets real: The technical differences in detail

IONIQ 9

Costs and Efficiency:

Price and efficiency are often the first things buyers look at. Here it becomes clear which model has the long-term edge – whether at the pump, the plug, or in purchase price.

Hyundai IONIQ 9 is substantially cheaper – starting at 59,900 £ , while the Mercedes SL Class costs 112,700 £ . That’s a price difference of around 52,833 £.

As for electric range, the Hyundai IONIQ 9 offers substantially more range – reaching up to 620 km, about 608 km more than the Mercedes SL Class.

SL Class

Engine and Performance:

Under the bonnet, it becomes clear which model is tuned for sportiness and which one takes the lead when you hit the accelerator.

When it comes to engine power, the Mercedes SL Class offers substantially more power – delivering 816 HP compared to 428 HP. That’s roughly 388 HP more horsepower.

When accelerating from 0 to 100 km/h, the Mercedes SL Class is substantially quicker – completing the sprint in 2.9 s, while the Hyundai IONIQ 9 takes 5.2 s. That’s about 2.3 s quicker.

There’s also a difference in torque: the Mercedes SL Class delivers substantially more torque with 1,420 Nm compared to 700 Nm. That’s about 720 Nm more.

Space and Everyday Use:

Beyond pure performance, interior space and usability matter most in daily life. This is where you see which car is more practical and versatile.

Seats: Hyundai IONIQ 9 offers more seats – 7 vs 4.

In terms of curb weight, Mercedes SL Class is considerably lighter – 1,810 kg compared to 2,594 kg. The difference is around 784 kg.

Looking at boot space, the Hyundai IONIQ 9 offers clearly more boot space – 338 L compared to 240 L. That’s a difference of about 98 L.

When it comes to payload, the Hyundai IONIQ 9 carries substantially more – 643 kg compared to 375 kg. That’s a difference of about 268 kg.

Who wins the race in the data check?

The Hyundai IONIQ 9 is clearly superior overall in the objective data comparison.
This result only shows which model scores more points on paper – not which of the two cars feels right for you.

from £59,900
IONIQ 9

Hyundai IONIQ 9

  • Engine Type Electric
  • Transmission Automatic
  • Drive Type Rear-Wheel Drive, All-Wheel Drive
  • Power HP 218 - 428 HP
  • Consumption kWh/100km 19.9 - 20.6 kWh/100km
  • Electric Range 600 - 620 km
details

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Costs and Consumption
View detailed analysis

Engine and Performance
View detailed analysis

Dimensions and Body
View detailed analysis

Hyundai IONIQ 9

The Hyundai IONIQ 9 is a bold step forward in the automotive world, combining cutting-edge electric technology with a sleek and modern design. This model stands out with its spacious interior and advanced features, ensuring both comfort and convenience for drivers and passengers alike. As Hyundai pushes the envelope in eco-friendly innovation, the IONIQ 9 represents the future of sustainable driving with its impressive range and performance capabilities.

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Reviews Hyundai IONIQ 9

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Mercedes SL Class

The Mercedes SL blends timeless elegance with a cheeky sense of occasion, its retractable roof turning any commute into a small celebratory parade. Behind the wheel it behaves like a grown-up sports car that prefers comfort and presence over headline-grabbing bravado, making it a tempting choice for buyers who want to arrive in style.

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15C1119_120
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Reviews Mercedes SL Class

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Hyundai IONIQ 9
Mercedes SL Class

Costs and Consumption
Price
59,900 - 75,500 £
Price
112,700 - 219,300 £
Consumption L/100km
-
Consumption L/100km
9 - 13.6 L/100km
Consumption kWh/100km
19.9 - 20.6 kWh/100km
Consumption kWh/100km
-
Electric Range
600 - 620 km
Electric Range
12 km
Battery Capacity
-
Battery Capacity
-
co2
0 g/km
co2
206 - 309 g/km
Fuel tank capacity
-
Fuel tank capacity
-

Dimensions and Body
Body Type
SUV
Body Type
Roadster
Seats
7
Seats
4
Doors
-
Doors
-
Curb weight
2,594 - 2,689 kg
Curb weight
1,810 - 2,195 kg
Trunk capacity
338 L
Trunk capacity
110 - 240 L
Length
-
Length
-
Width
1,980 mm
Width
1,915 mm
Height
-
Height
-
Max trunk capacity
-
Max trunk capacity
-
Payload
586 - 643 kg
Payload
145 - 375 kg

Engine and Performance
Engine Type
Electric
Engine Type
Petrol MHEV, Petrol, Plugin Hybrid
Transmission
Automatic
Transmission
Automatic
Transmission Detail
Reduction Gearbox
Transmission Detail
Automatic Gearbox
Drive Type
Rear-Wheel Drive, All-Wheel Drive
Drive Type
Rear-Wheel Drive, All-Wheel Drive
Power HP
218 - 428 HP
Power HP
435 - 816 HP
Acceleration 0-100km/h
5.2 - 9.4 s
Acceleration 0-100km/h
2.9 - 4.7 s
Max Speed
-
Max Speed
-
Torque
350 - 700 Nm
Torque
500 - 1,420 Nm
Number of Cylinders
-
Number of Cylinders
4 - 8
Power kW
160 - 315 kW
Power kW
320 - 600 kW
Engine capacity
-
Engine capacity
1,991 - 3,982 cm3

General
Model Year
2025
Model Year
2025
CO2 Efficiency Class
A
CO2 Efficiency Class
G
Brand
Hyundai
Brand
Mercedes-Benz
What drivetrain options does the Hyundai IONIQ 9 have?

Available configurations include Rear-Wheel Drive or All-Wheel Drive.

DriveDuel uses data analysis and artificial intelligence to evaluate vehicle data and create content. Content is regularly reviewed and improved. The displayed prices are estimates based on German list prices, adjusted to the respective country’s VAT. Country-specific registration taxes are not included. This information is not legally binding.