Pravah Picture HD and Sony Sports Ten 4 HD are exclusive to Sun Direct, as was Sports18 1 HD for many months. Investigation Discovery HD is only on Sun Direct and Airtel.
But Sun Direct is the only DTH not to have Sony Sab HD, Star Gold Select HD, Sony Sports Ten 3 HD, Nick HD+, Zee Tamil/Keralam/Talkies HD and technically Star World Premiere HD though it is shutting down.