There is a series on the character but this is the first time a movie will be made on him. There are a lot of interesting elements about Byomkesh Bakshy that can be showcased through Dibakar's film.
So, there was no need for them to take inspiration from Sherlock Holmes.
When contacted Dibakar he laughed at the rumours doing the rounds and added, "Detective Byomkesh Bakshy is an answer to Sherlock Holmes, not Sherlock Holmes. Byomkesh Bakshy remains the first and the most famous Detective in India wholly and solely Indian at heart, actions, methods, setting and style. This is the first time that Byomkesh will be on the big screen for all of India and the world! Why ignore the real Byomkesh stories - some of the most striking and original in the world - and borrow from a English franchise with no desi connect? Byomkesh Bakshy is an original and Desi jawab to Sherlock Holmes in Desi bhasha. He is completely original, secure and Indian from his dhoti to the Calcutta Tram ticket in his kurta pocket that is a clue to a mystery!"