I also test. Now on the way back to JB.  I snap some photos via Z1 and transfer to my phone. Monday will do comparison.

My impression on Z1:

• The screen is warmer, not good viewing angle. The optimize backlight just making the screen look even worst only. Dunno why Sony did this stupid feature, it is not stable and making the not so good screen became worst only.  Z1 screen is better than Z but worst than any flagship in market. After actual view, I can quite assure it is VA panel.  Z is TN panel and Z Ultra is IPS panel.
  
• Phone is smooth as usual.
  
• Camera quality is great when I view at phone. Monday I will post up comparison with Note 3. The snapping effect I really hate actually, I can't assure on the spot whether my snap is clear and sharp due to that snapping effect.
  
• Solid build but heavy.
  

Beside this, I also test out the Nokia Lumia 1020. The image is sharp but the color is shit! Why can't Nokia make a proper white balance, since PureView 808. All camera output color is way too yellowish with weird color tone. Also I notice the Lumia 1020 macro mode is the worst I ever seen. Want macro forget Lumia 1020, even the shop also said the macro distance cannot be as near as others phone.  Comparison with Note 3 will be post in Monday at Note 3 thread as well. All in all, want camera with lossless digital zoom - I will pick Z1 not this crap Lumia 1020 where closed macro also not possible with weird coloring.