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Mercedes SL Class vs Hyundai IONIQ 9 comparison

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

Mercedes SL Class vs Hyundai IONIQ 9: Key differences

Mercedes SL Class

  • significantly more power
  • significantly quicker 0–100 km/h
  • clearly lighter
details

Hyundai IONIQ 9

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

By Achim Sedelmaier

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

SL Class

Costs and Efficiency:

When it comes to price and running costs, the biggest differences usually appear. This is often where you see which car fits your budget better in the long run.

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 clearly more range – reaching up to 620 km, about 608 km more than the Mercedes SL Class.

IONIQ 9

Engine and Performance:

Power, torque and acceleration are the classic benchmarks for car enthusiasts – and here, some clear differences start to show.

When it comes to engine power, the Mercedes SL Class offers significantly 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 significantly 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 significantly more torque with 1,420 Nm compared to 700 Nm. That’s about 720 Nm more.

SL Class

Space and Everyday Use:

Cabin size, boot volume and payload all play a role in everyday practicality. Here, comfort and flexibility make the difference.

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

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

Looking at boot space, the Hyundai IONIQ 9 offers markedly 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 clearly 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 stands well ahead of its rival 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
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Mercedes SL Class
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Costs and Consumption
View detailed analysis

Engine and Performance
View detailed analysis

Dimensions and Body
View detailed analysis

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_012
15C1119_029
15C1119_120
15C1119_004

Reviews Mercedes SL Class

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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
Hyundai IONIQ 9

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

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

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

General
Model Year
2025
Model Year
2025
CO2 Efficiency Class
G
CO2 Efficiency Class
A
Brand
Mercedes-Benz
Brand
Hyundai
What drive types are available for the Mercedes SL Class?

The Mercedes SL Class is offered with 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.