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The Infiniti Q30 is a compact hatchback-sedan built on Mercedes underpinnings, giving it a nicer interior than most cars its size while sitting well below full-size luxury sedans on price. It never sold in huge numbers, so a documented service history is worth more here than badge reputation alone.
Infiniti sold the Q30 for a short run on one platform without a major redesign, so there is no later, improved version to wait for — buy on condition and spec rather than a specific year.
The BMW 730 and Lexus ES250 are both larger, pricier sedans, so neither is a direct swap for the Q30's smaller footprint. Both are worth knowing about if your budget stretches: the ES250 shows a mechanical fault on just 4% of examples against the 15% we would expect for sedans this age, and the 730 on 5% against 10%.
Comfortably into six figures. The Q30s we inspect in the Kingdom sit at a median of around 113,000 km, which is unremarkable for the class and suggests normal use rather than anything to flag.
Confirm condition against the CarSwitch inspection report before you agree a price.