S3 comes with a stylus?  I thought only the Note series had them.

1280x720 is IMO good enough for a ~5in screen.  I know some newer phones are coming with 1920x1080 at like ~450ppi, but that is rather excessive IMO.  To actually even see the difference, you'd have to have perfect vision, a 'perfect test picture', and hold your phone <20cm from your face.

Reviewers' opinions generally should be taken with a grain of salt.  I find that many tech enthusiasts go crazy at the slightest improvement a lot of the time.  And the fact that there's a lot of subjectivity in things and often enthusiasts can struggle with stuff which is considerably different to what they're used to.