The statement “The blanket is comfortable” is an opinion, not a fact. But if all 6 billion people on the planet tried the blanket and found it to be comfortable, would the statement become a fact?
still an opinion.
The blanket has an IEEE-123.4 comfort index of 102
IEEE-123.4 defines “comfortable” as an index between 90 and 109.9
It defines "extremely comfortable as an index between 110 and 119.9
It defines “blissful” as having an index greater than 120
What if 40 dying Presidents say the nourishment is palatable? Does it become a fact? 
It would still be an opinion; albeit an extremely widely held and agreed-upon opinion.
Let’s call it a consensus. Less subjective than an opinion, more subjective than a fact.
OK. I’ll bite. I think if everyone in the world agrees that the blanket is comfortable, that makes it a fact.
What makes a fact a fact is that it can be verified by experience. Verification is said to happen when the experience corresponds among all (or at least “enough”) observers. So if all observers have the experience that the blanket is comfortable, that the blanket is comfortable has been verified, and is thus shown, or proven, to be a fact.
Or?
this was kind of the type of response i was looking for… 
Wikipedia: Objectivity (philosophy) - Wikipedia [INDENT] A proposition is generally considered objectively true (to have objective truth) when its truth conditions are met and are “bias-free”; that is, existing without biases caused by, feelings, ideas, etc. of a sentient subject.
A second, broader meaning of the term refers to the ability in any context to judge fairly, without bias or external influence (see journalistic objectivity); this second meaning of objectivity is sometimes used synonymously with neutrality. [/INDENT] According to the first meaning, “This (rather awesome I should say) blanket is comfortable”, is not an objective fact because the quality of being comfortable is necessarily linked to a sentient subject.
“Everyone believes this blanket is comfortable”, is factual however (though I suppose it only considers humans and not cats who haven’t been tested).
I think the problem we’re having here is that humans have differences between them, even though huge numbers of humans are extremely similar.
I think in order to define this statement as objectively true, you’d have to say something like “all non malformed humans of <link to a specific genetic code set> find this blanket comfortable”.
Of course, comfort is subtle. Pain is less subtle. For a given group of human beings who share a common set of genetic code (where the differences are in areas that don’t matter), you could probably say that “this stimulus is painful”.
The definition of pain, of course, has to be “this area of the brain that registers pain will show voltage transients if you put electrodes there”.
Anyways, our reality is objective. “subjective” things are an artifact of our poor existing tools.
Is comfort quantifiable? If we determined that anyone in a “comfortable” state would have certain parts of their brain pinged if scanned by an MRI, and we were able to produce the exact same results in every human with said blanket, I think THEN it would be a fact.
Just like a gun shot to the temple would “hurt” you. That is a fact. It is not a fact that a bite from a fire ant “hurts”.
“Fact” is not a reserved word in science, so people who are pedantic about subjectivity and objectivity don’t usually argue about what is “fact”. As a truth claim, it is poorly worded, because it combines a subjective adjective “comfortable” with a universal claim “The blanket is”. You can easily reword it to make it testable “Everyone reports the blanket to be comfortable when they sleep under it”. Then you wouldn’t even need everyone in the world to test it, just a large enough representative sample to have confidence in the claim.
What that’s doing, though, is changing the claim to make it objective (i.e. a test of the claim has the same results for any observer).
You can’t turn something subjective into objective just by increasing your sample size. If everyone in the world finds it comfortable, how do you know? Because they say so? Ok, your claim has just shifted so that everyone says it is comfortable. That’s changed the claim so that it has the same results for each observer.
Objectivity has nothing to do with the sample size. That just strengthens or reduces the evidence for the claim.
Didn’t everybody in the world once believe the world was flat?
But the facts prove that to be untrue no matter how many were convinced, even over decades/centuries.
What is essentially different between “The blanket is red” and “The blanket is comfortable” if everyone, and I mean, and more importantly the Op says, everyone, agrees by virtue of direct experience that both are so?
“Earth is flat” don’t count because l’d say that was a hypothesis that was unproven by direct experience.
Still an opinion, because if someone says it’s not comfortable, they are not factually wrong.
Or to put it another way, “red” has some independent definition in regards to spectrum reflected from the object, while “comfortable” is defined entirely by people’s opinion of it. I.e. there is no proper definition of “comfortable” other than “people find it comfortable”.
The OP’s question is useful and insightful.
We find the distinction between subjectivity and objectivity useful but what we mean (whether we realize it or not) is whether our experience of a thing does or does not differ from person to person (and hence from vantage point to vantage point). If it differs, we tend to consider it to be subjective; if we and all of our instruments perceive the same thing, we consider it to be an objective characteristic of the thing in and of itself.
No obvservable quality is an objective characteristic of anything. All meaning is interactive and hence involves the observer. The search for objective meaning is really the search for enough info from enough vantage points that no vantage point is left out.
I don’t just think the blanket is comfortable, my physical experience of the blanket is that it is comfortable and I can verify that as often as you like.
For me, the blanket’s comfortableness is a fact, not an opinion.
What about Francis Vaughan’s definition (in Post #3)? 
But yeah: for “this blanket is comfortable” to be a fact, it has to be a statement strictly about the blanket itself, and not about the subjective experience of the person using it. It could be a fact, but you’d have to have an objective definition of “comfortable.”
Factually, there are more than seven billion people on the planet now.