This question is one of the old chestnuts. But there are always new answers as it's a rapidly evolving area.
Not quite pocket sized, but I had a Canon G15 bought after reading a number of glowing reviews. My style of photography is very much about the moment,
and the G15, while competent delivered a moment just after
the moment I chose. It's called lag. This will apply to most of the pocket compacts, so it's something to be aware of so as not to be disappointed with results.
My other gripe with the G15 which I believe shares its sensor with the S100 & S110 was the dynamic range. When you're used to FF DR, the easily blown highlights and blocked up shadows sucked a bit of the joy out of the experience. This is no fault of the camera, it is all to do with my unreasonable expectations. I no longer own the G15.
So I concur with others and would look to the Sony RX100. There are reviews all over the web, mostly extremely positive. A useful, independent mirrorless/compact destination is the refreshingly entertaining and informative Steve Huff. Take a look. http://www.stevehuffphoto.com/