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Joel,
Yes, the G3-16200 is a very nice camera!
Regarding noise - it is of course a complex issue, but when comparing signal/noise ratios of different image trains, a good first order guide is that, assuming subframes are sky noise limited, and quantum efficiencies are similar, S/N varies as (pixel size)/f-ratio. There are other factors in the exact equation, but the dominant factor is this ratio.
That would indicate that for your f/8 set-up you would require 8/3.6 times the total exposure that my f/3.6 set-up requires for the same overall S/N in identical shooting conditions.
So my 6 hours would translate to ~13 hours on yours.
As I said, it's just a rough rule of thumb. And remember doubling the exposure time on a given system only improves S/N by 1.4 times.
Mark
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