Would you mind to list some examples? I'm really interested in what you like/don't like or is missing.
Sure (doing this slightly rushed, so might forget some things, keep that in mind):
What my SGS3 lacks that my 920 has:
The gallery sync with skydrive/facebook
The way groups/contacts work with twitter/facebook on the live tiles as well as in the contactsmenu
The UI of the phone in general feels a lot more coherent, as well as the homescreen being easier to operate with a heavier workload
Wireless charging out of the box
The Me-tile
PhotoBeamer
What my 920 lacks that my SGS3 has:
Easy access to wifi/mobiledata/BT/NFC/etc toggles
Ability to select any MP3 as a ringtone directly on your phone
Ability to set custom sounds for notifications/alarms
Ability to lock screen during video playback to avoid the hazard of accidentally hitting the touchscreen/touchbuttons
Thats all I got, really, but theres obviously more in both coloumns that I havent thought of that might come to mind later on
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Was that something like what you wanted?