That's why, IMO, in terms of luxury/non-luxury, the judgement of the vehicle itself is more important than that of the brand/logo on it. I have seen a number of so-called "entry-level luxury" vehicles (Acura ILX, Audi A3, Cadillac ATS, Lincoln MKZ, BMW 1-series, Mercedes CLA, among others), that, for whatever reason (stiff ride, lack of noise isolation, cramped interior, poor fit/finish, lack of power, etc.....) I did not think were worthy of a true luxury moniker. Even on my own Verano (I'm not biased here LOL), which is otherwise quite well-built and matches some more expensive luxury cars on ride-quietness and front-seat comfort, its Ecotec engine noise that increases with revs and, in cold weather when the rubber in the 45-series 18" tires are hard and thumping with a firm ride over bumps, disqualify it from what I'd consider a true luxury car. It would be much closer to a true small luxury car with a V6 and 55 or 60-series tires rather then 45s.
On the other hand, I've seen some cars like the 2Gen Genesis, K900, Equus, Cadenza, 2014+Impala, recent Malibus, and, to an extent, even the present-generation Ford Fusion, that, IMO, delivered far more in the luxury-department than their modest logos/badges would indicate.....and the Genesis and Equus may finally be formally getting that now in their marketing.