Here's my 2¢,
I went from the N5 to the M9, lost the M9 got a Z3, now I'm waiting for the 5X.
The N5 is my favorite phone so far (tired with my EvoLTE) hated that it didn't have an SD slot so all my pictures had to get backed up then deleted from my storage. Besides that it was nearly nearly perfect.
The M9 had great hardware ( besides the back camera, the front camera was actually better and clearer than the back cam) and amazing software (still the top OEM skin).
The Sony Z3 had a promising start, I got it and I was instantly in love with the hardware, the look is beyond sexy and the glass feel was premium. The camera was miles better then the M9 but I feel it wasn't as good as the N5. SOFTWARE wise this has been the worst phone I owned, very little community support, flashing a custom rom is so troublesome, need to go through flash tools or else you'll softbrick, if you go ASOP you'll wipe the cameras DRM which would result in diminished picture quality. The Z3 has some very annoying bugs (I.E. when I send a phone call and then off the screen the phone hangs up and I call to call the person again, happens every time and super annoying) the photo album app is sub-par but it does have great service, i get service in places where my N5 didn't. (Also even with the 3gb ram I notice a little too much lag)
Now waiting to see if the 5X meets my expectations, if not I'll send it back try the 6P and if still a no go (I wear skinnys so I'm a bit worried cause the z3 barely fits) I'll just stick with my z3 until something hits my interest.
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