There is a 35mm film print scan available online. I wouldn’t call it an “end all” release, but it probably looks the best of anything you could watch. If the guys who scanned it ever get the time and/or money to make a finished release, that would be great, but to my knowledge that hasn’t happened yet.
And a 35mm copy isn’t the same as Harmy’s Star Wars releases. He uses 35mm sources, but they are Blu-ray based.