I first became aware of the lube splashes after reading a post on here from Nazareth. I had noticed the issue on my camera a few weeks before but wasn't sure about it. Since I noticed it my 1Dx between January 2013 and August 2013 had been back to Canon 5 times, 4 times for a sensor clean and once for the recall. During the recall service I asked them to clean the sensor as a goodwill gesture, which they did, came back absolutely filthy. So in September it went back again and Service told me they wanted to escalate it to Technical due to the frequency of the issue. I said I was going on a foreign trip and needed a body so I got a loan body which came from Germany. Guess what, exact same thing. Lube splashes on the sensor. So I complained again and I got a call telling me I was going to get a new 1Dx and my original was on its way back to Japan to be investigated. My new 1Dx after less than a thousand shutter activations started to show the exact same issues, lube spots that is, I've not seen the debris issue apart from once where it was a curled piece of debris that wouldn't shift. Basically if I am doing landscape work and shooting above F8 the spots are a big issue and increase pp time significantly, utterly depressing. I had not aligned my dirty viewfinder to this issue but from a reading this post I now see a connection raised by many.
I have not communicated to Canon regarding the sensor on my new 1Dx but I intend to shortly. Each time i do it I attach and image showing the problem. The guy who took on my case at Canon was first class in dealing with my case. I won't release his name to anyone though, sorry. For what it is worth I recently, (September) wrote to both the author of this site and The Digital Picture and both of them told me they had not heard of this issue.
When I read on this site today that Canon are rumoured to be releasing a new 1D body next year with a drop in price of the 1Dx it really makes me fizz.
Frankly the 1Dx is not fit for purpose.