Being speed tested are (from left to right) iPhone3Gs, iPhone4 and an iPhone5. This was tested about 5 meters from the wifi router. Please note, I get the same results when each phone tested separately. iPhone3Gs, iPhone4 both have on a cover and the iPhone5 is naked. iPhone5 running 6.0.2 update.
I have had Apple replace my iPhone5 with a new handset and all issues have gone away.
The new iPhone5 has just completed the same test... http://youtu.be/3LUs4BsREI4