When questioned what his father might think of the current state of affairs, Mr Tenzing did not hold back.
"I think he would be quite horrified with the way things have turned out. Since the time he was climbing there's been a complete change, a shift in the way people climb Everest and what motivates them.
"The sense of people going on an adventure, working together, doing something nobody's done before, with a sense of comradeship and working together - that spirit doesn't exist now.
"It's just a total service industry, where you're fulfilling the egos of western climbers and people from south Asia who want to test the limits of how close they can get to death, at great expense of the Sherpas. I don't think my father would want to be alive to see the circus that Everest has turned into."
Sherpa opens in New Zealand on Thursday April 7.