UMPC Portal was lucky enough to bring home the XPERIA X1 and write up their initial impressions:

For the short time that I used the phone, I definitely got a positive impression. Sony Ericsson definitely has a great device that will surely please many people. To sum it up on the software side though, the interface and usability of Windows mobile wasn’t much improved yet. I hope Sony Ericsson can do more about that to make this a phone no one will have a problem with using.

They’ve managed to take a side-by-side pic of the XPERIA X1 with the Nokia N95, as well as other devices. I’ve enhanced the pics for better viewing: