See:
No opinion on whether this is accurate or not.
No opinion on whether this is accurate or not.
Frederik has done some pretty good analysis and tracking of some of the 'quirks' of the X100 in the past and seems dedicated to offering useful insights on these cameras. While everyone will have different opinions, I tend to value his.
AF is super-quick, reminds me of using an OM-D with the 12-50.
So similar to the sensor on the X-Pro 1/X-E1 and it's 'optimistic' ISO ratings?
I'm just speaking based on what I've read in reviews. I've haven't done any testing myself with my X-E1 as it really isn't all that important to me - I was just asking out of curiosity.