A 135 photographic film frame (distinct from 35mm movie film) roughly has about 24MP - 48MP digital equivalent resolution. That has a photographic area of 864

A 135 photographic film frame (distinct from 35mm movie film) roughly has about 24MP - 48MP digital equivalent resolution. That has a photographic area of 864 square millimeters. 70mm movie film has 3395 square millimeters. That's like 943MP - 1886MP digital equivalent, if we use the same standards as 135 photographic film frame. There's no way you can replicate that amount of quality with digital cinema, at least right now. IMAX is similar in size to 6x7 medium format photography, which only recently has been fully replaced by digital cameras. The cameras that replace medium format photography (usually used for stuff like magazine cover photos, high end product photography, high end portraits and other high quality still applications) range from the sony a7r4 with a 61MP sensor, hasselblad cameras with 100mp sensors and phase one with a 150MP sensor. The digital video equivalent is 16K, which exists but it's just not common at all.