Mercedes-Benz has spent decades building the S-Class into the reference point for what a luxury sedan should feel like, and the label "S-Class of SUVs" gets thrown around loosely in this segment. In the GLS, though, it's not just marketing shorthand — it's an accurate description of how the vehicle is engineered. Slide behind the wheel or into the second row, and you can feel the S-Class's fingerprints: the same philosophy toward cabin isolation, the same layered approach to comfort features, the same insistence that technology should feel effortless rather than novel. The GLS earns the comparison in ways that go well beyond a shared badge, and it's worth walking through exactly where that flagship sedan DNA shows up, because it isn't uniform across every part of the vehicle.
Where the S-Class DNA Actually Shows
Start with the materials, because that's where the comparison is most obvious. The GLS uses the same layered, tactile approach to its cabin that defines the S-Class — genuine leather (or high-quality leather alternatives depending on configuration) across most touchpoints, real metal accents on switchgear rather than metal-look plastic, and open-pore wood trim that doesn't feel like a decal. The seats themselves borrow heavily from the sedan's playbook: multi-contour adjustability, seat massage functions on higher trims, and ventilation that actually moves meaningful air rather than a token cooling effect. This isn't a case of an SUV wearing a nicer badge over the same bones as a mainstream Mercedes crossover — the fit and finish genuinely reaches for sedan-flagship standards, and largely gets there.
The ride quality carries the same lineage. Air suspension, when equipped, does the quiet, difficult work of isolating occupants from road imperfections the way S-Class buyers have come to expect, smoothing out the kind of broken pavement and expansion joints that rattle lesser SUVs. It's not just about softness — the system also manages body control well enough that the GLS doesn't feel like it's wallowing through corners despite its size and weight, which is exactly the balancing act the S-Class has always tried to pull off in sedan form. Road noise suppression is similarly excellent; at highway speed, the cabin is hushed enough that conversation in a normal tone carries easily between the first and second rows, a detail that matters more than it sounds like it should on long trips.
Second-Row Treatment That Actually Feels Like a Flagship
The S-Class comparison holds up especially well if you evaluate the GLS from the second row rather than the driver's seat, which is a fair test for a luxury flagship — S-Class buyers frequently ride in back, and GLS buyers with families or drivers do too. Reclining rear seats, available rear-seat entertainment screens, sunshades, and independent climate control all show up here, echoing the long-wheelbase S-Class experience rather than a standard three-row SUV's afterthought rear cabin. On top trims, rear seat heating and even massage functions extend backward, which is a genuinely rare feature to find outside sedan flagships and the most expensive SUVs on the market.
The third row exists and is usable for shorter trips or smaller passengers, but it's fair to say Mercedes prioritized the first two rows more heavily in the luxury calculus, which tracks with the S-Class comparison — that sedan doesn't have a third row at all, and the GLS's rearmost seats read more as a practical addition than the primary showcase of the vehicle's flagship ambitions. Adults will find it serviceable for a trip to dinner or the airport, less so for hours on the interstate. That's a reasonable trade-off given the vehicle's overall mission, but families cross-shopping specifically for equally excellent second and third rows should test that third row themselves before assuming it matches the rest of the cabin's ambition.
Technology: Powerful, But Not Always Simple
Mercedes' latest infotainment and driver-assistance suite lands in the GLS in close to its most complete form, which is very much in keeping with S-Class tradition — the sedan has always been where Mercedes debuts and showcases its newest technology before it trickles down to other models. Large, crisp displays, available augmented reality navigation overlays, and a genuinely capable voice assistant all point toward the same technological ambition that defines the sedan. Driver-assistance systems, adaptive cruise functions, and parking aids likewise reflect the same top-shelf engineering effort Mercedes puts into its flagship.
The trade-off, and it's a real one, is complexity. The sheer depth of the menu structure in Mercedes' current infotainment system means that features are often buried several layers deep, and first-time Mercedes owners — even ones stepping up from other luxury brands — will need real time to learn where everything lives. Climate preferences, ambient lighting customization, and drive mode settings all involve touchscreen navigation that isn't always intuitive on the first attempt. This mirrors a genuine S-Class criticism as well: the flagship sedan carries the same "so much capability that it's hard to find things" issue, so in a strange way, the GLS inheriting that complexity is further proof of how faithfully it replicates the sedan experience, warts and all.
The Costs of Chasing Flagship Status
None of this flagship-level execution comes free, and the GLS makes you pay for it in several ways that are worth weighing honestly. Optioning a GLS up toward its most S-Class-like configuration — massaging seats across multiple rows, the most advanced driver-assistance package, premium sound system, executive rear-seat package — gets expensive quickly, and the gap between a base-configured GLS and a fully loaded one is substantial. Buyers should treat the window sticker on a well-equipped example as a very different number from whatever base pricing gets quoted in headlines, and should check current published pricing directly rather than relying on outdated figures, since luxury SUV configurations and packages shift from year to year.
Size is the other unavoidable cost. Like most vehicles chasing genuine flagship SUV status, the GLS is large, and that largeness translates into real-world friction: tighter parking situations require real attention, tight urban garages can be a squeeze, and the turning radius asks for more planning at low speeds than a smaller luxury crossover would. Fuel economy is also not a strength of this class of vehicle, and buyers coming from smaller SUVs or sedans should adjust their expectations accordingly — the GLS was never engineered around efficiency, the same way the S-Class sedan itself has never been the fuel-sipping choice in its own lineup.
Does the Comparison Actually Hold Up?
After spending real time in the GLS, the "S-Class of SUVs" framing holds up better than most marketing-driven comparisons in this segment tend to. It isn't just that the GLS carries a family resemblance or shares some parts-bin components with the sedan — the fundamental approach to materials, ride isolation, second-row treatment, and technological ambition all genuinely echo the flagship sedan's priorities. Where it diverges is exactly where you'd expect a taller, heavier, three-row vehicle to diverge from a sedan: the third row is a practical add-on rather than a showcase, the size introduces everyday friction the S-Class doesn't have to deal with, and the cost of chasing that flagship ceiling climbs fast once you start checking boxes on the options list.
Key Takeaways
- The 2025 GLS genuinely carries over S-Class-level materials, ride isolation, and cabin ambition rather than just borrowing the name.
- Second-row comfort and features closely mirror the long-wheelbase S-Class sedan experience, including available massage and entertainment functions.
- The third row is usable but clearly secondary in Mercedes' priorities, better suited to shorter trips than all-day family hauling.
- Infotainment technology is genuinely advanced but layered with menu complexity that takes real time to learn, echoing a common S-Class critique.
- Fully optioning a GLS toward its flagship potential gets expensive fast, and its size brings real parking and maneuvering trade-offs.
- Bottom line: buyers who want sedan-flagship luxury in SUV form will find the GLS delivers convincingly, as long as they accept the size, complexity, and cost that come with it.
