This is easily the best year for smartphones, thus far.
I mean, look at the following:
Sony Xperia Z
HTC One
Samsung Galaxy S IV
Samsung Galaxy Note III
iPhone 5S
Nexus 5 (if not X Phone)
Motorola X Phone
All, if not most with 1080p screens, quad core processors, wireless charging (a MUST for me) , 8-13 mega-pixel cameras, etc...
My front runner is the S4, followed by the Nexus 5, and if the X phone somehow managed to shock me (haven't felt Motorola up to this point) I wouldn't mind giving it a honest try either.
The iPhone isn't even really a consideration, the Note scribble lines after awhile would drive me crazy, the Sony reviews seem to be a tad on the unfavorable side, plus no wireless charging, the HTC One still could be a consideration.
The ones listed above S4>Nexus 5>X Phone are my top 3 considerations however.
Exciting times are shortly ahead!!!