I am not surprised at the results as the samsung s4 battery is like 1200 mAh more than the iphone 5 (s4 - 2600, i5 - 1434). So I would expect the battery life to last longer on the s4 during talk time taken into account if the both phone screens are off during the whole duration of the tests.
Exactly - battery life isn't made up of constant talk time, or constant browsing time. A mix of talk, browsing, videos, gameplay and standby time are what most users experience.
Given that most of these areas aren't even looked at in this article, I'll go ahead and go further than my previous posts and say its a load of bull. Nothing to do with the GS4 or any other phones mentioned. Simply the premise of the article and the tests conducted aren't enough information to make ANY sort of claim by.