Popular cars may be a reflection of social values, and if so, the waning popularity of Japanese luxury sedans -- once a salaryman status symbol -- indicates values are shifting.

The Japanese market for luxury sedans has shrunk by two-thirds over the past 15 years in line with consumers' diversifying needs; more people are opting for minivans and sport utility vehicles.

Yet top carmakers are now trying to buck this trend by introducing new models that may appeal to motorists outside the traditional bracket.