Sonyalphalab has published a part 2 of the article that looks into Sony RX1′s auto focusing. Keep in mind that this reviewer came from NEX-5N, expecting a good deal of improvement given their price points. The reviewer also compares auto-focusing experiences between the RX1 and the Nikon D600 (which is a pretty good and proven traditional PDAF body). There’s some experiences described under low lighting condition (which typical CDAF cameras don’t do too well). And finally, some street photography experiences have been documented here as well.
Their conclusion: The Sony DSC-RX1 full frame camera is not a camera for a person who needs to have fast autofocus. This would include a parent of a toddler or a parent with a child in sports. The 35mm lens is not ideal for sports, anyway. But the RX1 gets focus right more often than not once the focusing nuances are figured out. And when it does focus, the images that it can produce are as good as you find on any any autofocusing system at 35mm, I think.