X-E1 vs. X-Pro1 vs. X100 sensor differences?

Forgive me, I'm new to the Fujifilm X system. Do all three of these cameras share the same sensor? If not, what are the primary differences?

I read that the X-E1 won't have a low-pass filter. Is that true already of the X-Pro1? What about the X100?

Trying to get a sense of what the image quality differences will between these three cameras, irrespective of the other differences.