Wow, both comparisons are shocking. That red light looks heinous in the modern transfer, especially when you see it up close - the grid pattern thing is much darker than the original, and the reflection that was basically white is now this ugly dark purple.

And I know snicker says there aren't many green clipping issues, but I'm noticing that the green reflection on R2's translucent circle also seems to be overpowering compared to the 70mm frame. Is that evidence of green clipping?

And that laser...awful. That shot is recomposited, notice how the difference in grain between the 70mm and the Blu-ray is much more visible than in the other comparison. A lot of the recomposited lasers in that sequence have the same problem - the glow element is way too saturated and fat, there's no difference in opacity/density between the beam and the surrounding glow, and the actual beam shape just looks like a stencil on top of the glow.

The recomposited lightsaber shots had a lot of the same issues. Whenever animation was recomposited, there seems to have been no attempt to duplicate the way the various elements were exposed and layered in the original composites, or even to get the colors right. Thus we have things like Luke's saber looking white or greenish, even though it was most definitely BLUE on the original theatrical prints.