The film is sumptuous and lensed by the director who did double duty. However, it's kinds cheating since looking at the specs the base ISO is an incredible 800 with this camera and has a remarkable 14 stops of dynamic range.
It is in a way a cheat as the film is visually sumptuous but it has more to do with the technology. It was shot, pert much, using natural light documentary style. However, a camera with these kind of specs can't help but crank out gorgeous images in any manner of light -- and it does.
As for the film it's very good -- but not for everyone. Has a minimalist plot and is "meditative" in its pacing but manages to be engaging thanks largely to the immersive imagery, audio (which is great and overlooked) and pitch perfect performance.
Definitely worth a watch but somewhat overrated.
ARRI Alexa 65 digital large-format camera. "I didn't want this to a be a vintage black-and-white — a black-and-white that would look like something done in the '60s or the '50s," he says. "I wanted a digital black-and-white that would embrace digital, not try to hide the digital quality of it, with amazing resolution and amazing dynamic range and amazing definition."
'Roma' - Alfonso Cuarón