Do you think the Subaru Legacy model kit from hasegawa have a lack of details? 

well  Studio27 answer that question and produced this amazing Detail Set Up with  photoetched parts that allows you to detail both the interior and exterior of the Hasegawa Subaru Legacy.
Additional details for the Subaru Legacy RS Group A detail up set:

Manufactured by Studio27 in 1/24 scale with reference ST27-FP24223.

Includes metal parts, photo-etched parts, seatbelt fabric and assembly instructions.