As you'd expect, every forum thread on this film is dominated by the issue, and I found those measurements:
All original Paramount DVDs: 2.31:1 (non-stretched)
All Paramount SE DVDs and BDs: 2.33:1 (with stretching)
Title: Event Horizon 2-Disc Remastered Collector's Edition
Country: Germany
Region: B
Releasing Studio: 84 Entertainment
Case Type: Mediabook with 24-page booklet
Aspect Ratio: 2.54:1 (sleeve claims 2.35:1)
Codec: (MVC, AVC MPEG-4, VC-1, MPEG-2) AVC MPEG-4
Picture: (1080p/1080i 60/1080i 50 etc) 1080p
Soundtracks: English and German DTS-HD MA 5.1 (rear sleeve mistakenly states audio is Dolby TrueHD)
Subtitles (are they optional?): English, German (yes)
Cuts: (and if you know it, precise run time) None (95:57)
Commentaries: With director Paul W.S. Anderson and producer Jeremy Bolt (with optional English and German subtitles)
Extras:
"The Making of Event Horizon" documentary (with Play All)
- "Into the Jaws of Darkness" (14:57)
- "The Body of the Beast" (22:48)
- "Liberate Tuteme Ex Inferis" (19:55)
- "The Scale to Hell" (18:42)
- "The Womb of Fear" (26:36)
"The Point of No Return: The Filming of Event Horizon" featurettes (with optional commentary by director Paul W.S. Anderson) (with Play All)
- "The Rotating Corridor" (1:52)
- "The Crew Gathers" (1:14)
- "Shooting Wire Work" (1:36)
- "The Dark Inside" (3:28)
"Secrets" deleted scenes (with optional commentary by Paul W.S. Anderson) (with Play All)
- "Deleted Briefing Scene" (2:49)
- "Extended Medical Bay Scene" (0:54)
- "Extended Burning Man Confrontation" (6:20)
"The Unseen Event Horizon" featurettes (with commentary by Paul W.S. Anderson)
- "The Un-filmed Rescue Scene" (2:57)
- "Conceptual Art" (3:52)
Trailers
- Theatrical Trailer (2:27) (1080p)
- Video Trailer (1:48)
Notes: Unstretched transfer
Easter Eggs: None
Amazon ASIN (UK, French, German, USA releases only): Cover A: B07D4QMKST / Cover B: B07D389ZCF
Source:*OFDb and others
Title: Event Horizon 2-Disc Remastered Collector's Edition
Country: Germany
Region: 2
Releasing Studio: 84 Entertainment
Case Type: Mediabook with 24-page booklet
Aspect Ratio: 2.54:1 (sleeve claims 2.35:1)
Anamorphic?: Yes
PAL or NTSC?: PAL
Soundtracks: English and German Dolby Digital 5.1
Subtitles (are they optional?): English, German (yes)
Cuts: (and if you know it, precise run time) None (92:01)
Commentaries: With director Paul W.S. Anderson and producer Jeremy Bolt (with optional English and German subtitles)
Extras: None
Notes: Unstretched transfer
Easter Eggs: None
Amazon ASIN (UK, French, German, USA releases only): Cover A: B07D4QMKST / Cover B: B07D389ZCF
Source:*OFDb and others