I got to test one today

I gotta say the S4 looks much nicer compared to the SIII.
The aluminium lining of the S4 gives a much more premium feel, reminiscent to that of the old SII. The weight and feel of the phone is tremendously better, due to the less curvy design and more even weight distribution across the entire surface area.
The back cover of the black S4 version is kinda weird though, chequered kind of pattern which kinda reminds me of the Galaxy Nexus back cover.
The FULL HD screen surprised me a little bit as I didn't really expect that much of a difference compared to SIII's 306PPI but boy was I wrong. Everything looks so sharp and detailed, and now when I look back at my SIII, it doesn't seem that great anymore
I couldn't get the smart features such as Air Gestures and Smart scroll to work, not sure if it's due to my handling or what. I tried moving my eyes to the bottom and top of the page but it wouldn't activate the scrolling. Only when I tilt the phone a bit then only it works...
Overall, phone seemed pretty damn smooth during my short testing there. Surprisingly, transition animation is also pretty fluid without any hint of lag. Maybe I got to test a "good" unit

It seems like a very nice phone to own

Anyone wanna lend theirs to me for further poisoning?