Hi JJ, welcome to the Cameralabs forums!
The G7 can produce great quality out of the box, but like all non-DSLRs these days, suffers from noise at higher sensitivities. Whether this is acceptable to you is entirely personal. Did you have a look at our outdoor noise page here:
And our Gallery, here:
There's some higher ISO shots on both pages, so if they look fine to you, then go ahead! Hopefully forum member Shiva will see your message and comment, as he's a very happy G7 owner...