I saw the recent restored Metropolis (1927). Running at just under 2 and a half hours it's 25 minutes longer than the version I saw previously.
The restoration was taken from material which had been found in South America but had badly corroded. Although the restorers have done what they could, the restored scenes are very obvious when watching the film. They are watchable but still poor quality. However they do add to the film.
Some of the restored material is slight, but some are more significant. For instance Georgy (the worker rescued by Freder & they change places) and the Thin Man (Fritz Rasp) have more scenes particularly a scene with Josaphat.
Fredersen sees a huge sculpture of his late wife Hel at Rotwang's house and is overcome with grief (thus showing a more human side of him and why he became so hard).
The escape from the flooding city of the workers by Freder, Maria, Josaphat and the children is extended. In particular when they get to the top of the stairwell they find that it is barred and they try to break it down all the time children are trying to escape.
For a complete list of the added scenes:
http://www.kinolorber.com/metr...lis_added_scenes.pdf
Note that this list is duplicated.
There are a couple of scenes which are still missing so this version has boards to summarise what happens,
A 10/10 film and a very strong contender for the greatest science fiction film ever made, Certainly no other film before the film 2001 can compare to it.