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It's visible, but not huge. When PDAF works (the camera will switch to CDAF if it can't get a PDAF lock essentially right away, which is good, since it doesn't waste time and ensures accuracy), it's as fast as any current mirrorless cam out there. Near instant. When it doesn't, or if you're outside the PDAF points, it's relatively quick, but a step behind the fastest m4/3 bodies. Still faster than the X-E1 though. The big improvement is that it doesn't overshoot nearly as much.
I have not timed it, and don't really know how I would, but I'd say PDAF locks in less than 0.1 seconds. CDAF locks in about 0.2-0.4 seconds, unless you're massively changing the focus distance, where it becomes quite dependent on the focus motor's speed.
I haven't tested tracking AF yet. Probably won't be able to until Saturday.
Jordan, how big is the drop off in AF speed in the areas that aren't covered by PDAF? Also, how good is the tracking AF now in the X-E2?