Everytime I see this article mentioned, I cringe. I am a man with relatively small hands and I can reach the right edge and even the upper right corner of my Motorola Atrix 2 (almost as big as a Galaxy S II) easily. Have you actually tried this? Unless he has tiny, child-like hands, those graphics have to be inaccurate.
I can comfortably reach the upper right corner of my phone. Maybe I have larger hands than I think I do, or maybe I hold my phone differently than most people. But I still don't see how that blog post linked to in the parent comment is at all accurate.