s the BYD Seal better than entry-level luxury petrol sedans?

In many areas, yes. The BYD Seal has significantly better acceleration, fuel efficiency, interior room and standard features than the entry-level luxury sedans like the BMW 2 Series Gran Coupe and the Mercedes-Benz A-Class Limousine. But there are still some buyers who would like to have the traditional luxury badge and dealership experience that German brands provide.