There are many important factors in making digitally-originated footage look like film.
Before matching exposure, grain, and saturation, you must begin with a signal which is free of chroma subsampling artifacts, as colors are sampled in full resolution in the analog film world. Chroma subsampling is a process where the chroma channels are sampled at lower resolutions-- i.e., half vertically or half vertically and horizontally, leaving 1/4th the luma information per channel. This makes chroma channels appear 'blocky' and difficult to key since they are relatively low-rez.
Film can resolve billions of colors, unlike 8 bit DSLRs which can only resolve 256 shades of grey per color channel. 16 BPC (bits per color) resolves 16,384 shades of grey per color channel--- a massive improvement.
Banding affects digitally originated images, unlike film. So, to get close to film, you should have little-to-no banding in your digital images.
Aliasing affects digitally-originated as well. Harsh jaggy edges are not found in film, but are often found with digitally originated images.
Then, you need to replicate the gamma toe and latitude of film. An 8 stop DSLR will not look like 12 stop film.
Then match color saturation and grain and you should be close B)