Following up on Bottom Bracket and Ballen Photo:
The G6 operating times are given at http://www.dpreview.com/reviews/canong6/page11.asp
and this is a simplified excerpt:
Half-press Lag Wide (auto AF & AE) 0.6-1.0 secs.
Half-press Lag Tele (spot AF & AE) 0.6-1.5
Half to Full-press Lag (Viewfinder) 0.1
Half to Full-press Lag (LCD Monitor) 0.2
Full-press Lag Wide (auto AF) 0.8
Off to Shot Taken Wide (auto AF) 4.0
Shot to Shot Record review On 2.2
Shot to Shot Record review Off 1.9
The gist: if we find the time for half-press, then the G6 is reasonably fast, with virtually no lag if the LCD is shut down. Nice to know. And the proposed "commemoration second" could be unnecessary.
Some more on sharpness:
First the G6 itself: To say that ergonomics have been improved from G3/5 to the G6 is a complete illusion. For the sake of marketing, the body has been cropped and the left hand has no hold anymore, and the controls are definitely worse. To make up to some extent, the recommendation given in many postings before deserves to be emphasized: a Lensmate adapter permanently attached. It makes a most suitable handle for the left hand, and many more advantages have been mentionned too.
Then, weight: The G6 weights about 1lb/460g, a monopod say about 1.5lb/700g. If the G6 is attached to the closed monopod, without ground contact, this serves as a solid handle too. Now the pair has a lot more inertia, and correspondingly camera shake is far less likely. Nobody can object to this in areas where pods aren’t allowed (museums etc.) BTW: ball head and quick release are indispensable for the efficient use of pods. Pity only there is so little bottom area on the G6 to fix the plate to it.

