danny_boy said:

I actually have the priviledge of having watched them on a Sony 4K projector and it is brutal on optical composite effects shots/duplicate negative material.This is not the fault of the projector---it is merely accentuating the limitations of the technology used during the making of these films.

Limitations that were obscured by the photochemical analogue dulpication processes of the late 70's("less is more") when the film was running in theaters(be it 35 or 70mm) and also by the low resolution displays when these same films hit VHS/Beta/V2000/laserdisc aswell as (8mm and 16mm home movies).

And that is why, despite what some on this forum hope, we'll never get the OT released in HD with the original compositing.