Market Leader would be Toyota and Nissan
Follower would be Mazda.
I am only taking Japanese examples. Basicaly mazda had a very bad brand reputation in SL, But now Mazda has caputured the SL market ( This X 10 times worldwide as Mazda is doing Very Well ).
Few Years back i would have taken honda as a follower. In 2000 Honda became very popular and ate into the Market Leaders Share of Sales.
If you take overall Statistics, It would be maruti. But thats because people have no other option. ( Price ) LOL