Luxury performance cars typically aim to deliver strong road performance while accommodating a broad range of everyday comfort and passenger needs. Sports cars place driving response and involvement at the center of their identity, sometimes accepting tighter packaging or fewer comfort priorities to achieve a particular experience. The distinction is an emphasis, not a rule: a sports car can be luxurious, and a luxury performance car can be an engaging driver's car.
The meaningful differences appear in the complete design. Mass, seating layout, noise isolation, chassis tuning, and power delivery influence how each vehicle feels and what it can accommodate. Compare actual models rather than assuming that every sports car is small and firm or that every luxury performance car is large and soft.