Mercedes CLS Vs BMW 6 Series: Comfort, Performance, Value

Luxury grand tourers blend high-speed cruising with opulent comfort, and few models embody this better than the Mercedes CLS and BMW 6 Series. Both vehicles offer four-door practicality disguised as sleek coupes, delivering powerful engines, advanced tech and premium interiors. This comparison dives into their engines, handling, cabins, efficiency and value to determine which excels as the superior choice for discerning drivers.

Design and Body Styles: Sleek Lines Meet Functionality

The Mercedes CLS pioneered the ‘four-door coupe’ concept with its flowing roofline and aggressive stance, creating a sedan that looks like a true two-door sports car. Its frameless doors and sculpted body emphasize elegance over brute force. In contrast, the BMW 6 Series offers versatility with coupe, convertible and Gran Coupe variants, each featuring BMW’s signature kidney grille and athletic proportions.

Both cars prioritize style, but the CLS appears more futuristic with its bold creases and LED lighting, while the 6 Series leans sportier with flared wheel arches and dynamic lines. Dimensions-wise, they are closely matched, though the CLS’s sloping rear slightly reduces headroom for tall rear passengers.

• Mercedes CLS: Iconic four-door ‘coupe’ with multi-beam LED headlights and sculpted air dams.
• BMW 6 Series: Multiple body styles including Gran Coupe, with adaptive LED lights and optional spoilers.

Powertrains and Performance: Torque and Speed Compared

Under the hood, both models shine with turbocharged engines. The CLS400 packs a 3.0-liter biturbo V6 producing 329 horsepower and 354 lb-ft of torque, paired with a 7-speed automatic and rear-wheel or all-wheel drive. It accelerates from 0-60 mph in about 5 seconds. The BMW 640i counters with a 3.0-liter twin-turbo inline-six delivering 315-445 horsepower depending on the variant, achieving similar sprint times with sharper throttle response.

Diesel options add appeal for efficiency seekers. BMW’s 635d twin-turbo 3.0-liter straight-six offers over 40 mpg combined and 0-60 in six seconds, outpacing the CLS’s V6 diesel in refinement and torque. The CLS edges in base model horsepower and lighter weight, making it quicker in straight lines.

Fuel Efficiency and Running Costs: Balancing Power with Economy

Efficiency is crucial for grand tourers logging long miles. The CLS400 achieves 20 mpg city and 30 mpg highway, slightly better than the 6 Series’ 20/28-31 mpg in petrol guise. BMW’s diesel 635d claims over 40 mpg combined, ideal for European buyers prioritizing low running costs.

Pricing starts lower for the CLS at around $66,900 MSRP versus $79,500 for the 640i Gran Coupe, giving Mercedes a value edge. Maintenance and insurance may favor BMW due to its reliability reputation, though both demand premium fuel and services.

Interior Comfort and Technology: Luxury Redefined

Step inside, and both cabins exude premium quality. The CLS boasts leather seats, a 13-speaker audio system, ambient lighting and a digital gauge cluster with driver aids like lane-keeping and collision prevention. BMW matches with Dakota leather, 12-speaker sound, LED lamps and features like brake drying, stability control and BMW Assist.

The CLS offers superior ride comfort with its astonishing suspension, absorbing bumps effortlessly for long-haul comfort. Rear space is more practical in the four-door CLS, with a larger boot. BMW’s interior feels more driver-centric, with customizable digital displays and sportier seats.

• CLS strengths: Smoother ride, bigger trunk, advanced safety tech.
• 6 Series strengths: Sportier layout, ambient glow lighting, optional M Sport packages.

Handling and Driving Dynamics: Sport vs Serenity

Grand tourers must balance comfort and excitement. The CLS delivers serene highway poise with endless grip, though its softer setup lacks agility in corners. BMW 6 Series counters with firm ride, precise steering and superior handling, making it the driver’s choice on twisty roads.

Both feature ventilated brakes, stability systems and tire monitoring, but BMW’s Dynamic Traction Control shines in dynamic scenarios. For pure cruising, CLS wins; for engagement, 6 Series dominates.

Safety Features: Advanced Protection in Both

Safety is paramount. CLS includes active blind-spot detection, adaptive brakes and LED tail lights for better visibility. BMW offers parking sensors, anti-lock brakes with fade compensation and full LED lighting. User ratings give CLS a slight 4.3/5 edge over 6 Series’ 4.1/5.

Pricing and Ownership: Value for Luxury

CLS starts cheaper with more power per dollar, appealing to budget-conscious buyers. BMW’s options like M Sport add flair but inflate costs. Resale holds strong for both, with BMW slightly ahead in enthusiast markets.

Pros and Cons Overview

Which One Should You Choose?

Choose Mercedes CLS for effortless luxury and comfort on long trips. Opt for BMW 6 Series if you crave sporty dynamics and diesel economy. Both are icons, but your priorities decide the winner.

Frequently Asked Questions (FAQs)

Is the Mercedes CLS more comfortable than the BMW 6 Series?

Yes, the CLS offers a superior ride for grand touring.

Which has better fuel economy?

BMW’s 635d leads with over 40 mpg; petrol models are similar.

Are they true coupes?

Both are marketed as such despite four doors, thanks to sloping roofs.

What’s the price difference?

CLS starts ~$13,000 lower than 640i.

Which handles better?

BMW 6 Series for its agility and grip.