1. Lumia does NOT have Gorilla Glass! (I checked everywhere on Nokia's website and they didn't mention this feature at all for Lumia 800, will they miss such a feature?)
2. Lumia is quite thick (12.1mm compared to Focus S' 8.5mm)
3. Capacitive buttons are too close to the screen, easy accidental clicks
4. Pentile Matrix AMOLED, subpixels density is subpar. (though the actual image should be better than SAMOLED+ because of ClearBlack)
5. Door design for microUSB plug, which you are gonna use almost everyday, and the more complicated it is, the higher the chance it is to get broken.
6. No FFC for upcoming Skype integration (I don't care about this point tho).