Holographs are made right down to the spatial resolution of light, the interference patterns between light-as-a-wave from two different angles are what's laid down. So you could do a lot better spatially than what we do today.

Typical cell spacing is between 3 and 10 micro meter right now iirc and red light is around 650 nm, so about a factor of 5 to 10 or thereabouts.

Biggest enemies are not incident light quantity but thermal noise, as you get smaller in cell size that becomes a real problem (you can alleviate that with cooling).