Good review, I can't argue with anything he's said really. I did feel the XP1 was a firmware update or two away from being perfect and I'm sure with the improvements we've seen on the X100 that they will come.
But for me the OM-D fitted my needs better for now... that said I will keep a close eye on the XP1 and its development and the IQ is incredible.
I thought I was going in that direction when I started using my XP1 (admittedly the XP1 is getting more attention from me these days) however there are still situations where I need some of the NEX's unique functions which has led me to keep both cameras. I think in the end I just really like both cameras