Interesting Fact - Canon never released a G4 or a G8 because those numbers are considered unlucky in Japan.
G-Series
The G series cameras are Canon's flagship models aimed at prosumer photography enthusiasts desiring more flexibility than a point-and-shoot without the bulk of a DSLR. The G series features RAW image format capture, a lens with a wider maximum aperture, remote capture, faster electronics and a hot shoe for an external flash.