Apple® today announced that the iPhone™ will deliver significantly longer battery life when it ships on June 29 than was originally estimated during the unveiling back in January. Although, with all the non-mobile phone features one would need all the battery life possible.
It is unfortunate that Apple is forced to compare its iPhone with phones from the other manufactures like Nokia, Samsung and Blackberry. I think that iPhone is in a class of its own and will definitely shake up mobile phone / multi purpose portable device market, but personally do not think that any of the existing mobile phones can be compared.
I think that Apple also realize this, but most potential consumers do not, therefore they must compare these parameters (listed) of the iPhone with other devices.