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I have found that focus is faster with the "centre" rather than "flexible spot" option. Also, face detection is spookily good and will nail focus on the eyes at f2 somehow.
Also I was playing about in the kitchen and pointed the camera at the black & white tiles on the floor. They should make an excellent contrast detection target, but in flexible spot mode if the dividing line between a black and a white tile was horizontal across the focus point, the camera struggled, but if vertical or diagonal it focused straight away. Curious.
I was taking some pics of the kids today and my daughter turned tables and took this one of me. Super image quality from this little camera.
Christmas by Tobers, on Flickr
And here's the 1-1 of the same shot, which was 1/80th f/2 ISO 200 with an umbrella on the right of the camera triggered by a pocket wizard on the RX1. The camera was in face detection mode and centre focus point.
1-1 crop by Tobers, on Flickr