I don't know how the US version of the "Angst" blu-ray is but although I haven't seen it, the reviews of the French version make it a let-down for me. In addition to the French dubbing (which I don't like), they recropped the shots so a bunch of the super close face shots (for instance) are cut on the chin or the forehead, which is very annoying. They also darkened the colours on the rape scene so that you can't see most of it (apparently, it's some kind of auto-censorship asked by Kargl himself.) And I've also heard that some extracts from the soundtrack have been left out, and they also added a useless prologue to the film.
They showed it at an arthouse cinema by my place last weekend. I was about to go because "Angst" is my favourite film but when I heard they were showing the new, French, blu-ray version, I opted out in order to not be disappointed. I love the original one way too much.