If you like the interface on Sony's Xperia Z, but are stuck with the rather boring Samsung Touchwiz launcher, XDA member ThilinaC has released a download which may pique your interest. He's managed to port the Xperia Z launcher over to the Galaxy S2, S3, Note and Note 2 devices, which will overwrite the default look of your Samsung handset. It should even work on other custom AOSP roms as well.
The download comes with the new UI and some nice looking custom Xperia widgets, including the clock, weather, recent calls and notes app widgets. The launcher supports up to seven individual home screens and also allows for widget re-sizing.
However, there is a known issue with the launcher: if you attempt to open the themes options from the home settings menu, the launcher will force close. It's certainly not a major issue, and everything else appears to be working very well.
To install the Xperia Z interface on your Samsung phone you'll need to have ClockworkMOD installed, so that you can flash the zip file. You can get the download from here, just place it on your SD card and install through CWM.
If anyone has already tested this out, please let us know your experiences with the ported interface.