I'm mystified. The Sony RX100 claims to have a 1.0" sensor, then further specifies it as "13.2mm X 8.8MM". Maybe my math is all wrong but that is nowhere near 1 inch.In fact what I calc is a diagonal of about 16mm, which is about 2/3 inch.In area comparison to a 1/1.7 inch square (a rough estimate of LX7's sensor size, I get the RX100's sensor area at 251 sq mm and LX7 at 223 sq mm.
Could someone else give it a try and see what you calc. I'll admit an error on my part if I'm shown it.
Chaitanya S: disappointing little camera, sensor is much smaller than recently launched premium compacts.