First of all i was not commenting you,i was commenting the first man.I know who said what.
Secondly 2K resolution is good enough today.What about tomorow? In the future there will
be 4K digital cinema standards.
4K or 6K will give you all the details in the negative you need. Don't be deceved by the grain.
Grain is not the resolution limit. It is just a phenomenon of grouping of molecules,but film can
capture more details,beyond the grain limit.that is why even in still photography sometimes 8000dpi is
used.This gives you about 11K per frame of 35mm still film (or vistavision in motion pictures)
Grain can be digitally reduced without affecting the fine details beneath it.
For archiving there is no excuse for not capturing all the detail you had in your negative film.
And secondly a technical correction.
Star Wars was not SHOT on CRI's . CRI is a special form of intermediate film stock
made for speciall effects (of course not manufactured anymore)
It is a reversal film stock,not negative film.
All of the star wars was shot on negative film stock.
But the composites were printed on CRI's which fade in about 10 years or so.
In Star Wars SE you never saw any of the CRI footage because they used the camera negatives
and recomposited them onto new film stock.
The problem was that the actual color negative stock had faded.
CRI's have faded beyond use so they never used them anyway.The actual camera negatives
had faded about 10%
The color negative film that Star Wars was shot on was eastman II 5247
It was a color negative film stock (only one at the time) of ISO 100 speed tungsten balanced.
And all of the Star Wars was shot on it.
You cant shoot on CRI film stock. CRI filmstocks are used in optical printers (had been used)