Lets see your ISO 1600 pictures with your G7!!!

[Photolistic]

or G6 :P

Especially pictures with no flash!!!

[ray_lam5]

they arent gonna be as good as your 30D so if you tempted wait a year until they release an mini prosumer with a APS-C sized sensor then you will see some low noise high performance.

[GNMink]

Here are some ISO test shots I did when I first got my G7 comparing the S80 and S3 IS with it.

http://photography-on-the.net/forum/showthread.php?t=229994

there is also a link to all of the orginal photos if you would like to see more than 100% crops