I believe "they" liked the XZ2 over the RX100. The pic of the XZ2 is in front of the RX100!
That being said, I think it's hard to justify the XZ2's price point at $550. That's more expensive than an EPM2 and the EPL5 is just $50 more. The EP3 with 17mm can be found new for $520.
And all of that being said, I'm tempted to get a XZ2!