The G1 X Mark II's image quality is excellent for a compact camera thanks to the large sensor that lies at its heart, although we did notice more noise appearing slightly earlier in the ISO range than on the original model.
http://www.photographyblog.com/reviews/canon_powershot_g1_x_mk_ii_review/
Area in which the G1 X II really shines is image quality. Its 1.5"-type CMOS sensor allows for photos that come very close to what you can get from a consumer or midrange interchangeable lens camera, even at high sensitivities. Its fast F2.0-3.9 lens lets the photographer keep the sensitivity low and also allows for very shallow depth-of-field (not to mention beautiful bokeh) - something normally reserved for interchangeable lens cameras.
http://www.dpreview.com/reviews/canon-powershot-g1-x-mark-ii/
Canon Powershot G1 X Mark II has brighter lens with an improved zoom range, from 24mm to 120mm. Built in Wi-Fi and a 3inch touch screen let you quickly transfer images, as well as remotely control the camera. However, the camera is noticeably large, making it roughly the same size as a mirrorless camera, with a similar price point as well. For those that are familiar with Canon cameras, this should make an excellent backup to a DSLR however the relatively short battery life and slow continuous shooting when shooting Raw images is a little disappointing
http://www.ephotozine.com/article/canon-powershot-g1-x-mark-ii-review-25533
As far as high ISO performance goes, the Canon G1X Mk II seems to be about on par with Micro Four Thirds cameras. In essence, that means that it is pretty damned good.
http://www.thephoblographer.com/2014/06/16/review-canon-g1x-mk-ii/
The G1X II is obviously a camera aimed at skilled shooters, both in price and variety of settings. But that does mean that some of the more fun features that we see in other cameras (and other Canon modes) don't seem to have made the transition to this slightly more dour camera. There's no panorama mode, and the G16's 120fps video isn't there (I assume because of the much larger sensor). All told, the G1X II is a brute that needs to be babied.
http://www.imaging-resource.com/PRODS/canon-g1x-ii/canon-g1x-ii-shooters-report.htm
Mark II will suit photographers who want a walk-around camera when they don't want to lug a lot of equipment about. It's also an option for minimalistic travelers. Both G1X models provide a similar suite of functions to a DSLR in a relatively compact body, along with support for Canon's CR2.RAW file format.
For those seeking a small fixed lens camera to serve as a backup and/or a secondary camera to a DSLR, the G1 X Mark II can provide the image quality you're used to with an entry-level interchangeable lens model.
PowerShot G1 X Mark II Refurbished for $479
https://shop.usa.canon.com/shop/en/catalog/powershot-g1-x-mark-ii-refurbished
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