Lexus IS vs Mercedes-Benz SL-Class
A detailed look at how two of Australia's most popular Convertibles compare on price, running costs, safety, and everyday livability.
Specifications and pricing correct at time of publishing. Prices are RRP before on-road costs unless stated otherwise. Always confirm with the manufacturer or dealer before purchasing.
Lexus IS
Price TBC
Convertible
Petrol
2.5-litre naturally aspirated V6 petrol
153kW
9.3 L/100km
ANCAP: no data
109L
Mercedes-Benz SL-Class
From $386,500
Convertible
Petrol
Petrol
430kW
13.9 L/100km
ANCAP: no data
213L
Lexus IS: we're still completing price, 0-100km/h, warranty, ground clearance and braked towing.
A blank cell below means we don't have that figure, not that the car scores badly on it. We leave them empty rather than estimate, so any row where one car is blank isn't a like-for-like comparison yet.
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Price Breakdown
Pricing for one or both models is yet to be confirmed for the Australian market. We will update this comparison when official RRPs are announced.
Safety Rundown
ANCAP safety ratings have not been published for both models yet. We will update this section when crash test results are available.
Feature Showdown
Both come with modern infotainment systems.
The Mercedes-Benz SL-Class counters with wireless Apple CarPlay/Android Auto, head-up display, wireless charging, panoramic roof, heated front seats, Burmester audio and ambient lighting. Which feature set matters more depends on your daily routine and priorities.
Drivetrain
The Lexus IS uses a 2.5-litre naturally aspirated V6 petrol producing 153kW and 252Nm of torque, sent through a 6-speed automatic to a RWD layout.
The Mercedes-Benz SL-Class responds with a Petrol making 430kW and 800Nm, paired to a automatic driving all four wheels. It gets to 100km/h in 3.9 seconds.
The Mercedes-Benz SL-Class has the clear power advantage at 430kW vs 153kW. For most buyers, the way each car feels day-to-day matters more than outright acceleration.
Space & Comfort
The Lexus IS measures 4,635mm long on a 2,730mm wheelbase, 70mm shorter than the Mercedes-Benz SL-Class at 4,705mm (2,700mm wheelbase). The longer wheelbase on the Lexus IS generally means more rear legroom.
Boot space is 109L in the Lexus IS and 213L in the Mercedes-Benz SL-Class, giving the Mercedes-Benz SL-Class a 104L advantage. The Lexus IS seats 4 vs 2.
Turning Circle
Kerb-to-kerb diameter. Smaller turns easier in tight carparks and U-turns.
10.2m to 11.6m
Based on 10.2m turning circle:
- U-turn on standard street (7m+ wide)
- Standard parking bay
- Tight carparks
- Narrow laneways
Based on 11.6m turning circle:
- U-turn on standard street (7m+ wide)
- Standard parking bay
- Tight carparks
- Narrow laneways
Turning circle ratings
Compare U-turns side by side
Turning Circle · U-turn compare
kerb-to-kerb, 2 cars0 of 2 clear a 7.0 m street in one sweep
Green cars complete the U-turn; amber need a 3-point turn. Drag the slider to test tighter streets.
Standard widths: AU local streets ~5.5–7 m; main roads ~9–12 m.
True Cost to Own
Based on 15,000km of annual driving, fuel costs roughly $2,651/year for the Lexus IS and $3,962/year for the Mercedes-Benz SL-Class. That is a $1,311 annual difference in favour of the Lexus IS.
Who Should Buy Which?
Buy the Lexus IS if: You want lower running costs, or prefer Lexus's approach to design and ownership experience.
Buy the Mercedes-Benz SL-Class if: You prioritise performance, need more boot space, or prefer Mercedes-Benz's approach to design and ownership experience.
The Verdict
The Mercedes-Benz SL-Class takes 2 of 3 key spec categories. The Lexus IS will save you roughly $1,311 a year in fuel. If boot space matters, the Mercedes-Benz SL-Class has a clear edge. The best pick depends on what you value most. Explore the full specs for each model below.
Common questions
Which is cheapest, Lexus IS and Mercedes-Benz SL-Class?
The Mercedes-Benz SL-Class is the cheapest at $386,500 before on-road costs.
Which is the most fuel-efficient?
The Lexus IS uses the least fuel at 9.3L/100km on the combined cycle.
What are the ANCAP safety ratings?
None of Lexus IS and Mercedes-Benz SL-Class carry a published ANCAP rating yet, so there is no crash result to compare. Check back as they are tested.
Which has the most boot space?
The Mercedes-Benz SL-Class has the largest boot at 213L.
Which is the most powerful?
The Mercedes-Benz SL-Class makes the most power at 430kW.
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Disclaimer: All information in this comparison was believed to be correct at the time of publishing (20 April 2026). Prices are manufacturer recommended retail prices (RRP) and may vary by state, dealer, and options. Driveaway costs include estimated on-road costs for Victoria. Fuel economy figures are WLTP/ADR combined cycle. Specifications can change without notice. Always verify with the manufacturer before making a purchase decision. CarSorted does not accept payment for recommendations.
Auto-generated from CarSorted's specification data · 20 April 2026
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