I just checked on DxO comparing the G15 and G1X (large sensor):
G1X: about 2 stops better than G15 for noise and at higher ISOs
about 1 2/3 stops better for dynamic range, but at lower ISOs the
dynamic range is the same and at the lowest ISO the G15 is better
The G15 has a fast 28-140mm f1.8-2.8 and the G1X has a slow 28-112mm
f2.8-5.8, so at the wide end the G15 is 1 1/3 stops faster and at the
long end it is 2 1/6 stops faster. In other words, especially as you
start using the longer end of the zoom range the G15 will be using ISOs
that are 2 stops lower than the G1X. So, compare G15 ISO 200 to G1X ISO
800, G15 ISO 400 to G1X ISO 1600, etc.
The G1X is much bigger and heavier so for my uses of the camera it
was not really in the running. It was interesting to take a look at the
G15 vs. G1X results on DxO though. That G15 fast lens really makes a
huge difference.
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