I have seen two or three movies till date at sathyams S2 theyagaraja cinemas. No doubt its one of the biggest theatre with seating capacity of more than 800+, giving rough figure. The interior of its theatre is really wonderful and gives it a very royal look. The cinema themed with red and crafts work on wall gives romantic feel when lights incident on it.
Talking about picture qyality, its up to the mark. You can enjoy each detail of your movie. Sound is perfect and has good bass and treble ratio. This I experienced while listening songs in a movie.
The theatre is on road side, so easily accesible. The outer side is not that clean and well maintain. But you can manage with it. Because the real magic is inside.