Hi,
As a working photographer who lugs around a D3s kit with all the bits and pieces that goes along with it on a daily basis, I have the LX5 for a family snappy camera.
I also have used the GF1 quite a bit which is similar in many aspects to the GF2.
The LX5 has a much smaller sensor than I am used to, as as a result, many of the shots I have in my head don't necessarilly equate. But mind you it is tiny tiny camera and for convenience it is pretty nice.
Noise can become an issue quite quickly, I find that 640 is my personal limit, but of course you can set it much higher.
the video is really lovely. 720p out of this tiny thing is pretty amazing!
The GF1 i liked a lot more. the bigger sensor gave a much nicer look to pics (both DOF considerations and noise). everything else Image Quality wise as great as to be expected from a bigger sibling of LX5.
nowhere near as compact, but I think for the extra sensor size, is probably worth the trade off.
Also a big thing is the operational noise. The LX5 (with the "fake" shutter noises set to OFF), is silent. The GF1, with it's mirrorless system, does emit a noticeable noise. But of course, nothing like a clunk of a DSLR with it's mirror slap and springs and aperture blades and shutter curtains....(if this actually matters to you at all....)
but coming from full frame to these little things I am probably being a bit harsh.
I love the little LX5, it gives me the ease of snapping pics while still allowing a lot of the professional options such as RAW and controls, but the GF series just offers that little bit extra that you may find useful.
The other cameras I have no real hands on experience except a few snaps on friends' ones, so I won't pass comment here.
good luck with your purchase!