Samsung must be feeling pretty smug right now, whilst Apple must be feeling that the test wasn't done correctly.
It seems that if battery life is your key concern, then the Samsung Galaxy S4 should be your first choice. We do add a bit of caution to the result though from our own completely non-scientific experience, where we find that all the phones there do seem to last much of a muchness, (give or take a couple of hours) during the day, and perhaps pure call usage, or data usage is too simple a summary of how long a phone will last you in day to day usage. I get at least 24 hours usage from all the recent top end phones I've used.
It still makes for an interesting read none the less.