the s4 has better hardware but the design really puts the idea of getting one out the window, I was always more interested in hardware than design but this time around I just really can't go with that, I gave the s1 away because I didnt like the shape, but loved the s2 and it served me very well till the s4 is out, it was a long wait to see what the s4 really looks like, and before it actually went on sell I decided to get the Z, for 3 reasons, first obviously the shape, looks just like the s3, for some reason I just don't like that round shape, second european version it uses Qualcomm APQ8064T Snapdragon 600 Quad-core 1.9 GHz Krait instead of Quad-core 1.6 GHz Cortex-A15 & quad-core 1.2 GHz Cortex-A7, the Z running at 1.5 for me is more than enough to run everything I play with, plays Real Racing 3 very well thats enough for me, might as well go with the Z, third the water resistant is handy. so far I'm very happy with it. if I had gotten the S4 I know for sure I will wipe and go custom before I even use it, which I did with the S2, the interface all look the same, and look similar to iOS, the screen indicator actually looks the same. but with the Z, all I did was updated the firmware and root it, done nothng else with it since, havent had any lag on anything so far. 20hours on battery with phone, wifi, data, camera, gaming, map, gps, text messages, facebook, web browsing mix usage, still at 41% interesting to see how the S4 holds the battery