Good review marco, I hope you don't mind me adding a few things (having also used both)
-> In my opinion the camera performs considerably better than anything out there so far. Although alot of it has to do with the user, I've found that the imobile gave more consistent results, and wins by a large margin on night shots (strong xenon flash, and excellent long exposure shots). I also favour the imobile's access to more settings than the 903SH, such as ISO and Exposure Value.
I'm sure these photos have been linked to at some point on this forum:
-> Requires a few more button clicks to open folders etc than the 903SH menu
-> A2DP works flawlessly; it paired up with my Sony DR-BT10CX headset first try. However, I will note that when broadcasting multimedia through A2DP, the mp3 player won't run in the background.
-> Reception in North America isn't as strong as the 903SH.
-> Smaller than 903SH!
-> Photo viewing via the photo gallery is much better on the imobile. The 903SH takes forever to update its file list and you can't view in grid-preview.
-> I miss the size of the 903SH screen