Yeah there's about a 50 seat difference between the theatres so Canada you're spot on that Canada's auditorium was slightly larger, however Dreamworld also have some breathing space (lobby, the now closed Boost Juice shop etc.) to fit queues etc.
Interesting thought - folks just queued for Imax sessions out in Main Street, although I don't see this ride eating up hundreds of people at a time.
Not even close. Here's a great comparison:
(Being real super nerdy, Dreamworld's IMAX was the first in the country and had an old school GT projector.)
The Dreamworld Cinema was originally an IMAX Theatre. If you've never been to an IMAX Theatre showing something on its unique 15/70mm film, you're missing out. Still to this day nothing comes close.
Back in the day, traditional IMAX (by comparison to a traditional theatre) meant a giant picture in a deep auditorium, 15/70mm film (compared to 35mm film that also contained the audio waveform on it) & impressively powerful sound inside the theatre. However, because of the insane costs to running IMAX theatres, from the physical cost of huge platters of film, or the licensing fees to the super delicate consumables like lamps, the landscape of what makes IMAX has changed over the years, especially with digital IMAX (2x 4K dithered laser projects which is still arguably not as good as 15/70mm showings) superseding or taking over the majority of IMAX showings in cinemas globally.
If you're in Melbourne, go to the IMAX theatre there and see something on film. It's just incredible. Quoting John,