The short answer
Based on available data, the Jaguar XJ comes out ahead of the Lexus LS on power. Check the specs table and owner sentiment below for the full comparison before deciding between the two. Both are covered by real owner reports on CarWizz.
Overall
Sentiment is deeply divided and heavily dependent on the specific generation and powertrain. For the classic X300/X308 (mid-1990s to early 2000s) and the Ford-era X350/X358 (2003-2009), long-term owner feedback is mixed, with strong praise for their distinctive styling, luxurious interiors, and driving experience, but severe criticism for reliability, aging poorly after high mileage, and costly repairs. The aluminum-bodied X350/X358 generation, in particular, is noted for its rust-free construction and more reliable naturally-aspirated 4.2L V8, with some owners reporting affordable maintenance using common Ford/Lincoln parts.
Best version to buy
For the X350/X358 generation (2003-2009), the 2006-2009 model years with the naturally-aspirated 4.2L V8 are recommended to avoid early issues present in 2004-2005 models. The Super V8 (SV8) trim is highlighted as a particularly good example.
Known issues
Overall
The sentiment is overwhelmingly positive, characterized by deep owner loyalty and satisfaction with the vehicle's core mission of providing unparalleled long-term comfort, refinement, and reliability. The LS is consistently described as a benchmark for a "decade-plus" ownership experience with minimal drama, offering a sense of solidity, quietness, and effortless power that makes other vehicles feel "a bit cheap by comparison." While there is strong consensus on its supreme comfort and build quality, nuanced criticisms exist regarding specific model years and components. The LS460 (2007-2017) is praised for its bulletproof V8 but noted for expensive wear items like control arms and air suspension.
Best version to buy
For the LS460 generation, later model years (e.g., 2017) are implied to be more refined and reliable than early first-year models (e.g., 2007), which are described as "Toyota's bastard child for reliability." For the current LS500 generation, the LS500h AWD with the "Teammate" advanced driver-assist system is mentioned as a highly capable but rare and expensive configuration. There is no single trim consensus, but the underlying recommendation is to seek well-maintained examples with full service histories, regardless of specific year or trim.
Known issues
The verdict
The Lexus LS is the better choice for most buyers.
It has stronger reliability sentiment in owner reports than the Jaguar XJ, based on the data above. If the specific known issues on the Lexus LS are a dealbreaker, the Jaguar XJ is worth a closer look instead.
Common problems by model year
Other comparisons
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Owner reports lean more positive on reliability for the Lexus LS than the Jaguar XJ. See the known issues comparison above for the specific concerns owners report on each.
The Jaguar XJ seats more passengers than the Lexus LS on its catalogued best-equipped version. Body type also differs: the Jaguar XJ is classed as a Sedan, the Lexus LS as a Sedan.
The EPA rates the 2019 Jaguar XJ at 18–21 mpg combined and the 2026 Lexus LS at 21 mpg, depending on the version.
Exact maintenance costs aren't in our data, but owner reports mention cost-related concerns more often for the Jaguar XJ than the Lexus LS. See the known issues comparison above.