Actually I just did an interesting little experiment.And I may have to eat my own words about not watching the prequels.
I have an Optoma 533st DLP 1080p/24/60 short throw projector.It can beam an image 3metres wide from a distance of just 1.5-2m!!.
I also have a Blu ray player.
I configured my system to show an image 2.7 m in width and 2 m in height on my bedroom wall(which is white).Believe me...for home viewing it is awsomely big! I also stood barely 1.5 meters away from the screen; which is probably a lot closer than I should be(but it was just an experiment)
I also selected a native resolution rather than 16:9(which made the image fill out the entire w/h off the screen).
I popped in my 2005 ROTS DVD(which is upscaled on my sony 300 Blu ray player. I watched it from the point of where the Jedi get wiped out by the clones all the way to the end of the film.
Straight after I stuck my 2004 SW:ANH DVD and watched it up to where Luke and Owen meet C3P0 ect...and I stopped there.
And you know what the story continuity/Imagery/Evolution and look of the characters and scenery actually worked!!!(IMHO ofcourse!!)
The sheer size of the image gave a lot of scale to the CGI heavy ROTS.
Scale I did not appreciate when I saw it in the cinema 5 years ago(I was seated quite far back on that occasion).It is also scale which quite frankly cannot be observed my 21 " widescreen TV ------ ROTS just looks like plain shit on that!
Even though the aesthetic of much of the scenery in ROTS has a shiny clean veneer to it(coruscant,utapao and even Mustafar) the image size really helped me aknowledge the detail on say for example CGI Yoda's face--- which gave it alot more believability.And all of this in nothing more than upscaled 560i.No doubt it will look even more amazing in full 1080/24p.
And here is the kicker----watching ANH immedietly afterwards was a revelation.The Gritty look of the opening scene in the rebel blocade runner combined with it's razor sharp editing actually worked quite beautifully with the pristine look of the same blocade runner seen in ROTS a few minutes before.Also seeing the beefed up Prowse Vader compared to the anorexic Hayden Vader only minutes apart actually is quite convincing.Again this all My opinion.I could go on.