From a pure glance, the Xperia Z3 is the phone to get it if the camera improvements and the battery enhancements are actually substantial. An Xperia phone has yet to launch day 1 in the United States, so this might be the first time Sony dents the market remarkably.
Samsung shit the bed with the Note 4. I don't really care for the "premium" feel of the device seeing as I use a Slim Armor Case (as a Note 3 owner). Also I worry about the unneccisary super high resolution screen which is sure to take a hit on battery life.
The LG G3 has a myriad of issues that are well documented across XDA.
The One Plus One turned out to be the malfunction of the year.
Finally, the HTC One M8, while coming in a close second, still has a piss poor camera.