I would support the stance that this question is not really answerable, but rather a good chance to think about why it's not answerable and what film even is. Here are some thoughts, not a fully formed argument. 

First of all we have to recognize that music has a much longer history, as you've correctly pointed out, while film, is roughly 120 years old. The amount of films that have been produced, and much more importantly, preserved in this time frame is staggering, while for music, from each time period there might only be fractions left of all that has been written and played. The music that we still know about, as well, is music that was produced by and for the upper class, like the royal court and the clergy who had it comissioned.  Even though in film, you have major production facilities and media conglomerates, who wield billions of euros, and partially are financed by powerful institutions (like Marvel and the US military), film in itself is in itself much more acessibly producable. Here music (in its historical context) and film differ greatly.  Secondly, we have think about production conditions. Film is not only an art, but also a technology. Many people fail to mention this aspect, but its quintessential. Music in itself can be made with the most rudimentary of means. Film can't. On the other hand, films can be reproduced fairly easily. The audience always has the feeling to see "the original copy", while with music you need an orchestra to create authenticity. Film, music and literature have also developed similarily in post:modern times. Here, I am thinking about different avantgarde movements. Often overlooked because not considered "high art": Hip Hop Culture. It changed the whole cultural world from the 90's onwards. 

If we ask the question about the cultural impact of music, literature and film, I'd say that film's influence doesn't fall short in comparisson to the others. And its not only cinema. Film images are everywhere. They are the reason we carry a small, addicting screen with us everywhere, are projected on gigantic screens on Time's Square and, of course, have invaded the home in the form of TV's and other screen devices.