A post on the Beyond3D forums has claimed that Tomb Raider: Underworld on the Xbox 360 is not in high definition, though the PlayStation 3 version is. Rather than bore you with all the technical details, here is the picture form (click to enlarge):
As you may (or may not) be able to see, the PlayStation 3 screen capture is slightly better quality. Let’s try another one:
For those who understand the technical details about television scanning lines, the Xbox 360 resolution for Tomb Raider: Underworld is apparently: 1024×576 2xAA whilst the PlayStation 3 resolution for Tomb Raider: Underworld is apparently: 1280×720 2xAA (also known as 720p). It is unknown why the PlayStation 3 resolution is higher.