Canon G10 Shooters

I have a G 10, S95 and G1X.  I agree with other posts that the resolution of the G10 is brilliant, and it took some considerable time to conclude  that the G1X provides slightly superior Jpg results at low ISO.  I am no Technician, but I wonder why the files from the 14mp sensor of the G10 are much larger than those ​of the 14mp sensor from the G1X.  More compression or size of sensor I presume. The G10 is a true marvel and I have some incredible images from it.  Unfortunately, it has become a little redundant so may consider trying to sell. Thanks for the post.