I would like to answer your question with another question: what would be advantages for you?
More legroom for driver and more legroom in the rear? Or even more legroom in the rear with the E32 L-version?
A V12 engine with 300 HP?
A second aircon in the rear? A cooler box in the Highline version?
Longer wheelbase?
Single electric rear seats?
http://www.bimmerboard.com/forums/posts/361206/
http://www.bimmerboard.com/forums/posts/361259
http://www.bimmerboard.com/forums/posts/361310
dimensions are here
http://www.7-forum.com/modelle/e32/technische_daten.php