Z4 doesn't look like much of an upgrade to the Z3.....
For anyone curious what the differences he's talking about are.
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Snapdragon 810 processor
Slightly lighter 144g, compared to the Z3’s 152g. It’s also marginally slimmer at 6.9mm.
Front camera is 5.5MP sensor with a 25mm wide-angle lens with OIS.
Battery is slightly smaller at 2930mAh compared to the Z3’s 3100mAh power pack
As far as we know, everything else is the same as the Z3.