It is not exactly pocketable nor slim compared to the likes of , say, s100 and many reviews said it is huge. However to me it is compact compared to dslr or maybe mirrorless interchangable lens systems with their lenses on (except Pentax Q). Some photos to have a gauge of its size.
G1X compared to Canon 500D with 18-200 kit
(Sorry for quality, taken using my mobile phone under poor lighting)
G1X vs iphone 3GS in length
Almost the same in length
G1X vs my wallet (typical male's wallet)
The protruding lens makes it thick but again this is due to big sensor, the need for more glass