No, currently there is no movie based on 'Solo Leveling'. However, there are other forms of adaptations like the webtoon and the light novel. The webtoon has been extremely successful in bringing the story to a wide audience. Maybe in the future, we will see a movie adaptation, but for now, it doesn't exist.
One possible difference could be in the level of detail. The novel might go more in - depth with character thoughts and emotions. For example, in chapter 71 of the webtoon, a fight scene might be shown more briefly compared to the novel, where it could be described with more elaborate language.