I believe some of you have owned both the X100 and the X10. In terms of:
2) Operational speed
How would you compare the two. I recently purchased a used X100 and I am very impressed with the output from the camera. Thank you.
I have both cameras. The IQ of the X10 is VERY good, except when it produces orbs, which is often in many situations. The X100's IQ is still superior as is the low light ability. It seems to shoot a bit faster than the X100 but then again, I use slow cards, class 6. The X10's auto focus seems faster than the X100, probably due to the smaller sensor and lens.
Color of the X10 is wonderful, but then again, so is the X100's. They are both great, but different. It is a damn shame that the X10 has such a fundamental problem such as orbs.