How's the lens?
I'm not sure I can afford a new camera at all yet, but my camera ogling is currently split between the Olympus XZ-1, the Fuji X10 and this camera.
It seems that this camera with it's 28-200mm equivalent f/2.8-5.6 lens can actually give you at most f/2.8 at 28mm, f/3.2 at 35mm, f/3.5 at 50mm, f/4 at 85mm, f/4.5 at 105mm and f/5.6 at full telephoto (200mm equiv).
The XZ-1 has a f/1.8-2.8 lens running from 28mm to 112mm equivalent, giving you f/1.8 at 28mm, f/2 at 35mm and 50mm, f/2.2 at 85mm, f2.5 at 105mm and beyond.
I've not found any such detailed information for the X10, but it runs from f/2.0 at 28mm and f/2.8 at 112mm.
In terms of sensors both the X10 and XZ-1 seem to have 1/1.7" sensors while this has a slightly smaller 1/1.8" sensor. Additionally the X10 is based on a CMOS sensor wheras the other two use CCDs. And the X10 has a lovely mag alloy body. On the other hand it is significantly more expensive.
On paper the XZ-1 still wins in terms of selective depth of (in-focus) field, and is just about the cheapest (although the P7100 is not much more currently and may drop lower). The X-10 may be better for low light photography with it's CMOS sensor, but it's slightly slower lens may offset that. I think the XZ1 the slowest of the three in terms of shot-to-shot time (though I've not seen the P7100 and X10 compared in that respect). And it has the worst handgrip and no viewfinder (though that doesn't matter much to me personally).
But I think the XZ-1 has the sharpest lens, though certainly the latter two have acceptably sharp lenses. The XZ-1 lens is a pocket rocket though, only let down by a tendency towards barrel distortion out wide.
I haven't seen proper comparisons in terms of handling yet. I suspect the P7100 and X10 are neck and neck. Oh, I don't know, but then I don't actually think I can afford the outlay at the moment anyway.