"I don't think we should get too hung up about whether their subsidies are slightly bigger than ours. There's lots of advantages for New Zealand productions."
Mr Key did not know whether New Zealand was considered as a location for 20,000 Leagues Under the Sea, a remake of a movie based on a Jules Verne novel.
New Zealand's Large Budget Screen Production Grant provided a 15 per cent rebate for film and television productions worth more than $15 million. Rebates were also provided for digital and visual effects work done in New Zealand.
Mr Key was lobbied by Fox, Disney, Warner Bros, Universal, Sony and MGM to raise these subsidies during an visit to the US in October.
Australia offered a 16.5 per cent rebate for film productions and a 30 per cent rebate for and digital and effects work.
The National-led Government changed employment laws and granted tax breaks amounting to $67 million to Warners in 2010 to ensure that The Hobbit films were made in New Zealand.
Documents released by ministers in Febuary showed that the studio in charge of The Hobbit, New Line Cinema, had received "very attractive incentives" from Australia in exchange for filming The Hobbit in New South Wales.