Like has been said, battery life comparisons are pretty much meaningless. It just depends on how much you use it and what you use it for. Even location can heavily influence power drain if the radio is having to search for a signal a lot. And by location I don't mean city to city, it could be block to block or even room to room.

Probably the only worthwhile comparisons are battery capacity vs screen size. Comparing those will give a rough idea of what to expect, but only very rough. It won't tell you much about power drain during stand-by, phone calls, etc. And the type of screen, not just size, will influence things.

IOW take any subjective opinions about battery life with many grains of salt.