Unfortunately, the Hitman HD Collection does not contain the first part of the saga. I am Hitman player from the very beginning and therefore was quite clear for me to include this collection in the collection. As for the HD point, this Collection is not the ne plus ultra, but a difference to the PS2 version can be seen clearly.
Who has not played the Hitman parts and would like to do this, which this collection was warmly recommended. For 10 euros per game, the price / performance ratio is definitely given.