Just been pointing it around the office at random subjects and distances. It definitely feels a lot more responsive! It is able to quickly decide which direction to adjust focus in. Movement speed is then limited by the lens itself how fast it gets to the focus point. Once it finds it, it overshoots a little and goes back again for the shot. If the subject is a short distance away from the previous focal point, then it is much faster than if the lens has to seek further.
I haven't really analysed it yet, but there are some cases where it seems too eager to focus, giving lock when the shot is not in focus. These were mostly with self-lit subjects (monitors, lights).
Also I just quickly tried the continuous focus on two targets, moving it back and forwards in front of the lens. Not impressive unfortunately. Seems slow to respond and sometimes doesn't respond at all just hovering over the initial focus distance.
My initial verdict is:
For single-shot AF, it is almost as good as a DSLR.
For continuous AF, it is still of questionable usability.
_________________Canon DSLRs: 7D, 5D2, 1D, 600D, 450D full spectrum, 300D IR mod
Lenses: EF 35/2, 50/1.8, 85/1.8, 135/2+SF, 28-80 V, 70-300L, 100-400L, TS-E 24/3.5L, MP-E 65, EF-S 15-85 IS
3rd party: Zeiss 2/50 makro, Samyang 8mm fisheye, Sigma 150 macro, 120-300 f/2.8 OS, Celestron 1325/13
Tinies: Sony HX9V.