I use Canon DSLR's, but for a compact I wound up going with the Sony RX100. I looked at the Canon S110, G1X, and G15 pretty carefully. Ultimately I thought the G series was bigger than what I wanted for this purpose (some pocketable), and I felt the edge in IQ over the S110 warranted the higher price (grudgingly). But as other's have said--if you want to match the RX100 in IQ with a Canon compact, you're kind of stuck with the G series (which isn't really all that compact). That being said--I think the S110 is pretty good as well (judging from the "sample photo books" at Yodobashi Camera where I was shopping).
I do have a complaint with Sony cameras though. I live in Japan, and if I want an English language menu I have to buy a "Sony overseas model" (at a higher price). Canon, Nikon, Olympus, Pentax, heck--even Casio--include Japanese and English on their menus (as well as many other languages).
Anyway, I bit the bullet and bought the overseas model for the RX100. But I had been thinking about a NEX in the future as a mirror-less system. Less enthusiastic about it now.