Claims that Metal Gear Solid 5: The Phantom Pain outgrossed Avengers: Age of Ultron's opening day may be somewhat exaggerated.

According to Adobe Digital Index, Hideo Kojima's Konami swan song made US$179 million worldwide on day one, which is over twice what Ultron earned on its opening day.

Tamara Gaffney, Adobe principal analyst and director, claimed the numbers demonstrated "the gaming industry is a lot bigger than most marketers realize."

But for starters, the $84 million figure being bandied about for Ultron is a US domestic figure, and does not take into account the 44 other countries in which the film opened that day.

Further clouding comparisons, movie tickets in the United States generally cost less than US$10, compared to $50+ from game sales.

Movies make money longer than games as well; Ultron has made over US$1.4 billion worldwide thus far, and that's before broadcast and home video sales.

With the rise of digital retailers, it's also more difficult to gauge sales numbers for video games than it is for cinema box office, which has long-standing systems in place to measure financial performance.

The gaming industry is indeed, as Gaffney says, a huge business. But it's a different industry to Hollywood, so direct comparisons are difficult.

Still, US$179 million is an impressive figure by any standard.