Electric cars and luxury sedans describe different characteristics, so they are not opposing categories. Electric identifies the propulsion system. Luxury sedan combines a passenger-body style with an emphasis on premium comfort, materials, equipment, and refinement. A luxury sedan can be battery-electric, gasoline-powered, or hybrid.
When comparing a mainstream electric car with a conventional luxury sedan, separate the changes caused by propulsion from those caused by body design and equipment. Charging, energy use, and engine-related servicing belong to the powertrain comparison. Seat comfort, ride quality, sound insulation, controls, and luggage access must be judged on the actual vehicles.