Most of Mr.Viswanaths's films have titles beginning with the letter "S"
Mr. Viswanath introduced song writer, Sirivennela Seetaramasatry through the film Sirivennela.
Mr.Viswanath also introduced song writerSri Veturi Sundara Ramamurthy
Producer Edida Nageswara Rao considers Mr.Viswanath as his godfather since Mr.Viswanath was highly responsible for the success of Mr.Raos's production company, Poornodaya Arts. Poornodaya Arts gave in some fantastic hits by Mr.Viswanath, not to mention Shankarabharanam and Sagara Sangamam which are considered to be masterpieces to date.
Kalavaramaye Madilo a 2009 movie starring Kamal Kamaraju and Swati Reddy, often referred to as Colors Swathi was appreciated by Mr.Viswanath. Director Satish Kasetty said that he was really blessed and fortunate to receive appreciations and blessings by his godfather, guru Mr.Viswanath.
Chiranjeevi, the Megastar of Tollywood considers Mr.Viswanath his guru. He said at the 30 years celebration of Poornodaya Atrs function that " I learnt acting from my gurugaru, Viswanath garu. He told me how to act and he brought out the actor in me." Chiranjeevi was considered a mass hero by fansn. He acted a completely different role of Sambayya in Swayamkrushi, for which he gained recognition as a "true actor"
Rakesh Roshan, father of Hrithik Roshan, after the success of 'koi mil gaya' said "i can say my son is a good actor if K.Viswanath makes a film with him".
Swathi Muthyam was India's official entry to the Oscars in 1986.