Questions & Answers about Этот фильм лучший.
In Russian, the verb “to be” (быть) in the present tense is usually omitted in simple sentences like X is Y.
So instead of literally saying Этот фильм есть лучший, Russian just says:
- Этот фильм лучший. – This film (is) the best.
The verb есть is only used in special contexts (contrast, emphasis, older style, or when it means “there is/are”). In normal, modern speech, saying есть here would sound very unusual.