I haven't done any serious shooting with it yet; but I was impressed by the image quality from raw samples I found online. It's the same sensor as the G3X, G7X and G9X, which have received good reviews for image quality. Initial testing indicates it's on a par with the G1X noise wise.
I was looking at the G3X; but the CA at the extreme ends of the zoom was just too severe for me (uncorrectable in some of the examples I found). It is also a lot larger and the EVF is extra cost.
It's almost identical in size to the G12, the body is thinner; but the lens assembly is thicker to accomodate the faster lens. The EVF makes it a tad taller. It's also lighter than the G12.
The EVF is very, very good, not much more to say here.
The LCD is a lot larger than the G12 leaving less room for buttons.
The large LCD and thinner body obviously created some challenges so the ergonomics are possibly not as good as the older G series. The buttons are smaller and have a softer touch - will take some getting used to. The battery is also a lot smaller, will see how many shots it gets in real life. The battery will charge from the USB cable (seperate charger is also supplied). Does not come with a USB cable which is pretty cheap on Canons part.
Plugging in the USB cable wakes up the camera - could be useful for long timelapses if we can take advantage of it.
I prefer the older style front dial, the new knob takes getting used to.
Having said that the controls are still very good for a compact camera. The LCD is also a touch screen with the usual Canon interface.
Currently I have it set to M mode with Av on the lens ring dial, ISO on the rear dial, and Tv on the front dial. I can quickly adjust all settings without taking my eye from the viewfinder. If I select auto ISO then the exposure compensation dial is also easily adjustable with my thumb. With the histogram displayed in the EVF it is easy to get the correct exposure.
Phil.