The Zeiss Ikon has now been on the market since 2005, and its track record is good in terms of mechanical reliability and durability, although five years certainly doesn't compare with decades for the Leica.

However, I don't think that you can say that it's more or less reliable or durable than a Leica at this time until we hit the 10-year mark and see how many of them are still in service and whether we begin to see widespread problems with the shutter, the rangefinder system or the electronics.