D600 dust - fixed??

Actually it is. So bad, in fact, Canon has issued service advisories and there is no permanent fix even after 4 years:

http://cpn.canon-europe.com/content/news/EOS_oil_spots.do

The only reason I know how to wet clean a sensor is from my Canon bodies. So far so good with D300 and D600.

I would be willing to bet that anyone, from any camera brand, will see a "disproportionately high number" of imperfections on the sensor shooting white paper at F22 and then applying curves in PP. People who use their cameras like normal people probably do not notice it, or do not care about the 1-2 small spots only visible in some shots, or they put on their big boy pants and do a 60 second wet clean.  The actual problem is with cameras that throw unusually large amounts of oil every 100-200 shots.

I think you are misunderstanding me. The problem is simply the perceived severity of the problem, which applies to everything, not just cameras. Most people will take the time to complain, where almost nobody will take the time out of their day to say how happy they are with something (again, this applies to pretty well any product/service). What you get is a grossly disproportionate number of negative to positive posts, and any casual user browsing the forums will have a distorted idea of the problem severity.

The only evidence anyone has, whatsoever, that the problem is disproportionate, is forum responses, which unfortunately is the least reliable method possible for collecting accurate statistical data. The fact that you, or anyone else, has had problem cameras is no more credible than myself having many perfect cameras. So what to make of that? The fact of the matter is nobody has any way of knowing exactly how many D600's have a legitimate problem where the sensor needs cleaning every 100 shots or whatever. I do not put these people in the same category as those shooting F22 white paper shots and thinking the world is going to end because they see 1 tiny spec.

Now, what I find much easier to believe, is looking at how most companies, Nikon included, normally deal with issues and have in the past. Whenever a company determines there is a problem that affects enough product (I'm sure they have their own internal numbers), they will issue a service advisory. Nikon has done this countless times in the past. The second scenario is if there is a safety issue (i.e. Batteries, automotive industry related issues, etc.). I am far more willing to believe both history and common sense than I am forum posters who, being human, are many times more likely to write about problems than they are perfectly functioning products.

Again, I have never once denied some cameras have the issue, what I keep saying is that people who use these forums as a gauge as to how many D600's may be affected are not doing themselves any favors. Add to that the fact that whenever someone posts that they are happy with their D600, people reply with things like "nope, you're wrong, every single D600 has the problem and that's that".

Anyways, my apologies if anything came across offensive in anyway to you. I think you just misunderstood what I was getting at.