I'd love to see a comparison of this camera with the Canon G1X - they seem very close in specs and Canon's G series have always been popular with pros for a pocket camera.
Given how big and heavy the X Vario is as fixed lens cameras go, I would also suggest comparing it to the Sony NEX-6 with 18-55/3.5-5.6 lens attatched: this X Vario probably uses the same 16MP Sony sensor, has a slightly slower lens of more limited zoom range, weighs about 130g more, is slightly wider and higher, lacks a built-in EVF ... and ironically, it is the NEX-6 that could be used with Leica M lenses. The Fujifilm X-E1 with its 18-55/2.8-4 is also of similar weight, size and sensor specs.
That Leica lens better be stunningly good, because it effectively adds about US$2000 to the price when you compare the rest of the body to comparable CSC bodies like the NEX-6 or Fujifilm X-E1.
At least you can get the add-on EVF for $200 instead of the list price of $500 -- by using instead the Olympus VF-2.