By looking at the Canon G1X sensor size, I think Canon may be "getting it" finally with what we want for a super compact digital camera. A larger sensor with better image quality.
You're probably like me in one aspect. You want to take quality photos without lugging around a big bulky camera sometimes. Canon did a great job at fittinng a big sensor inside the G1X
This option had been long overdue. One of the challenges that came along with designing a bigger size sensor in a smaller camera is how to handle the change in the needed larger lens design.
Rumors of a 1 inch sensor in the soon to be announced Canon G17 could become exciting news for Canon shooters if they are a reality.
Early on, many photographers including the author, got fooled by the megapixel myth. We thought that the more megapixels you squeeze onto a sensor the better the image quality.
That is only partially true. There are several other factors that come into play, the biggest being the actual width and height dimensions of a digital camera sensor.
When you do a comparison between two cameras and their sensors it's important to look at the number of megapixels as well as the overall dimensions of the sensor.
Larger sensors generally perform better than smaller sensors at high ISO settings. The camera's processor makes a difference on how the image noise is handled too.
You can compare the technical test results on dedicated camera review sites too, but it can be a little overwhelming or confusing to understand the.
I like to do comparisons between cameras by reading the reviews and opinions of actual, everyday, and regular consumers who have purchased them on Amazon.
G1X sensor size vs. other G and APS-C sensor sizes:
The newer Canon G1x Mark II may use the exact same sensor as the original G1x, although it is usable with several different formats, the standard 3:2, and four others.
For more about the sensor on the Mark II and it's different available aspect ratio you can read this article: Canon G1X Mark II Sensor
Canon Camera Geek.