The same number of page, the same cover (in fact urtext has only blue cover without drawings or colours so it should cost less)
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Daniel,
You're not buying paper, you're buying intellectual content. Henle tries to produce editions as close to the composers intentions as possible. However, Koji is right, they're still edited.
There is noting magical about the word Urtext, and Henle is not the only publisher who makes urtext editions.
It's very simple. There is usually only one publisher who has the rights to the Urtext.
Where did you hear this? Not true because a) look at the Wiener and Henle catalogs, and see the overlap. b) that statement presupposes the actual existence of Urtext.
If you look at what goes into making an authoratative edition - mixing and matching material from signature, manuscript, first edition, first German edition, etc. - you realize there really is no Urtext. What is it - the manuscript, first edition, first edition after composers' revisions, etc.? Anyone can call en edition Urtext, but they are still editions.
It's great that the editors at Henle and Wiener worked so hard to create these authoratative editions, but they are not without error.
BTW #1 - Henle is probably the best edition for Schubert, but Neue Bach Ausgabe, Breitkopf und Hartel is better for Bach. In fact, you might want to ask your teacher about this. No one who knows what they're talking about thinks Henle is the best for every composer,
BTW #2 - If you have sticker shock at the prices of your sheet music, wait till you see the prices of the text books they want you to buy.