ISO Comparison:
To illustrate each camera's ISO range, we set them to aperture priority mode at f/4 and shot the same basement scene while varying the ISO.
It should be noted that the P7000 features a High-1 ISO mode above ISO 3200 and that the LX5’s ISO maxes out at 12800. However we opted to draw the line for our high ISO comparison at 3200 for two reasons. First, because the G12 maxes out at ISO 3200 and second, because it is highly unlikely anyone would be shooting at an ISO higher than 3200 on any of these compacts due to the noise levels.

Canon G12 low ISO 80, 1 sec shutter (Full-Resolution Original)

Canon G12 high ISO 3200, 1/25 sec shutter (Full-Resolution Original)

Panasonic LX5 low ISO 80, 1.6 sec shutter (Full-Resolution Original)

Panasonic LX5 high ISO 3200, 1/25 sec shutter (Full-Resolution Original)

Nikon P7000 low ISO 100, 2 sec shutter (Full-Resolution Original)

Nikon P7000 high ISO 3200, 1/21 sec shutter (Full-Resolution Original)