I have to agree with eewiz. The first iPhone was revolutionary and every smartphone from every manufacturer since then, including Apple, has been evolutionary.
Higher res screen, more megapixels in the camera, faster processor, cellular link evolution from 2.5G to 3G to LTE -- it's all very logical and predictable. That's not to say that today's phones aren't better than those of years past. They definitely are. They just don't offer any new features that truly startle the consumer.
You know what might be revolutionary? A battery that lasts all week but has the same volume & weight as today's smartphone batteries.
"A battery that lasts all week" - Now that would be a genuine revolution.
My first cell phone was a Motorola analog flip phone. I could generally get a day out of a charge. By the time I was up to a Motorola Razr flip phone, I had about a week of battery life. Now with my smart phone, I'm back to generally being able to get a day out of a charge.
I do like a number of the features we get for that price, but I'd almost rather have a separate phone with a week-long battery and a smart-phone sized tablet for all of the other functionality.