I don't understand how this statement keeps surfacing. The iPhone 5 is quite arguably the most "changed" iPhone yet... It is the first iPhone to have a different screen size, it has had the largest performance increase over the previous model ever, it has a completely new lightining connector, revised headphone jack location, LTE support and is the thinnest and lightest iPhone yet. Not to mention better cameras front and back and a revised design...
Exactly where do you have a hard time finding the differences?