Well, I think it best to ignore the entire projection system an focus on the film. There are too many variables that can reduce detail. Just considering the film itself, I thnk, will give a more certain answer.

I have access to very little, but what I do have is Star Wars EPS 4, 5, 6, and 1. I know Team Negative 1 had access to several prints so I’m not sure it is accurate to refer to their two offerings as single prints. I can see differing resolutions in A New Hope so it may be that they had to use some from a lower quality copy. But generally those are effects shots. The test is pretty consistent between grain and detail between ANH and TESB, and even Harmy’s ROTJ. I have not done an exhaustive comparison, just some basic ones on frames I have from multiple sources. That led to my above conclusions, but I’m hoping others have looked into it more.

While grain is fine in the final product, with each generation grain as well as the optics of the duplication process degrade the fine details. I’ve noticed that grain can hide some of the data loss in the projects on here. If you add grain to the GOUT it looks higher quality. That’s one of the things Harmy did on the Despecialuzed Edition.