I was very tempted too by this camera when I first learned that it was gonna come out.
But I've been waiting too long now, since september.
In the meantime, pentax in Europe at least has conducted a great marketing operation between nov 2010 and jan 2011, offering a significant discount to every new owner of a K-R or K-5.
So I went for a K-5 because all this time along, there was nowhere to have an X100 just in hands at least... yes, at least, to see if that viewfinder is confortable or not in terms of width of what you see inside.
That's an important matter for me : how big is the image that you see in the viewfinder.
Not being able in any sorts to check that specific parameter in time (before the Pentax special offer expired), I didn't want to take the risk, so went for the K-5.
I've also anyway been having concerns about the sensor itself-for what I read here and there, that sensor is not based on Fuji's latest sensor technology -> what about quality in the high ISO range ?
That brings me to the next point : even though it opens at f1:4, it's true that it doesn't have a stabilizer.
Ok, true, IS is not an obligation, and one could say 'hey ! how d'you think they did back in the old days !' Well I've known the old days, and they were nice, but so is IS today.
Indeed the camera is nice, and even more than nice, but at that price, IS could/would somehow be expected.
That brings me to the last point : the price.
Back in Sept 2010, Fuji seemed to say that it would cost around 1000$.
... but recently, at the CES that took place in Vegas last week, Fuji finally communicated the accurate figure : 1199$ !!!
There again, that perspective makes me surely not regret to have chosen a K-5 !!!
Still, I sure am going to check out that creature as soon as it gets out in stores !