In message ,
Pix on Canvas wrote:

The truth lies somewhere between two extremes of statistics. FZ cameras
don't need as high ISO settings in low light as a Canon DSLR does so
attempting to make a Panasonic look bad at high ISO is distorting the
truth for the sake of promoting Canon.

That is easy to circumvent; DPR gives the f-stop and shutter speeds, so
all you have to do, really, is the math to expose the absolute exposure
of each; wher one has x stops more exposure than the other.

Personally, I think that the better way to compare is to use absolute
exposure that is fixed in a comparison, and then bringing the resulting
images to the same tonal curve in the display images. Then you are
really comparing two cameras at the same light level (assuming that the
f-stops and shutter speeds are fairly accurate in the cameras compared;
shutter-speed can be circumvented with manual flash, leaving only f-stop
as questionable).
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John P Sheehy