I borrowed a friend's Sony RX100 over a weekend and was greatly impressed by the quality of the photos it took compared to other pocket digital cameras I've used/owned, especially in low light, where it gives crop-dslrs a run for their money. But while it's certainly not slow at focusing, the one I borrowed was still not as fast as a dslr at starting up, focusing or (at least if you shoot in RAW as I was doing) time-lag between shots - though for all I know, it's better at all those things than any other pocket camera.