Nikon D600 or Fuji XE-1

I recently purchased an XE-1 as a Christmas gift to myself and have until the New Year to decide if I want to keep it or not. A few days ago Nikon offered a nice sale on the D600 with kit lens for a $700 discount meaning I could get the D600 with lens for $600 more than I paid for the XE-1. I do mostly landscape photography and am thinking for my purpose the D600 may be the better camera over the long haul. I have been going back and forth in my mind over reasons for and against swapping out for the Nikon. I am however a little concerned about dust and oil issues on the sensor I am hearing about on the D600. I would like to hear thoughts on this from those of you who own both cameras. I have to make a decision by Dec 29th. Thanks.