These are just a few shots I took real quick. I will try to get better shots after I finish and have more time. I don't have a dedicated camera so sorry for the poor quality. The photo's make them look blurry but they are not in person. None the less you can get some idea of the actually color difference. The Nascar photo is the Silky Faille, the Wedding photo is the Cotton Sateen, & the Superman poster is the Cotton Poplin. I still have not mounted the Kona but I did lay the pictures on top of the Kona to give some comparison. the Superman Poster was used only because it was easiest to remove from my wall. The others have quack puddy holding them so my dual VTF-3 MK4's don't rattle them.
My photo's don't have a lot of black in them. Except for a few small detail like the tire on the car or the suits in the wedding photo most of the blacks you see are shadows. Like the steps on the wedding photo which is a greyish carpet and the black is the shadow of the steps.
All the fabrics except the Silky Faille are fairly close with just a slight edge going from Kona, to Cotton Poplin then to the Cotton Sateen. But the king of these 4 fabrics is without doubt the Silky Faille.
Some quick notes. The Silky Faille doesn't wrinkle like the other fabrics. It had a couple light creases from the fold but they came right out. I did not iron the Silky Faille but did iron the other three fabrics. The Silky Faille does not stretch like the others and ended up with the tightest mount to frame which is good. It also feels the best to touch and more resembles a actual photo print. I can't say enough good things it just hands down blows the others away. IMHO it's going to be hard to find a fabric that beats it. Even if the print quality of others can match it the other factors like the no stretch and just feel of the product is going to be hard to beat. I am definitely going to order Performance Knit on my next project (hopefully soon) because I just have to know how it compares. Personally I don't like the feel of the swatch sample I have of the performance knit but I feel it deserves a chance since others have used it and like it. Believe me if it turns out to be better I will say so. I am not a fanboy of any particular fabric and have no reason to just give my honest opinions. I do believe the Performance knit most likely outperforms print quality of the Kona, Poplin and probably the cotton satteen (although the cotton sateen was recommended over it by spoonflower). I am taking nickboul review in account that it is much better than Kona and IMHO the Poplin and Cotton Sateen although slightly better it isn't complete night and day at a glance.
This is just some quick info as I am to busy to right a 10 page review covering every last detail. They all work so just look at pictures of all the fabrics in this thread and go with whatever looks best to you. It won't hurt my feelings one bit because I am not a fanboy. Just trying to help others with my opinions. I'm pretty sure I will have some Performance knit in my hand in a few weeks. Until then I see no reason to not agree it is mostly likely one of the top fabrics. I personally would not recommend Kona even though it was the original fabric used. It works and no reason to run out and have your posters reprinted but IMHO it just doesn't compare. I'm also not saying Silky Faille is the absolute best fabric because I have not tried all 12 fabrics.
OH! I forgot to mention all of the people who have seen these so far in person (about 10) agree the Silky Faille is much better looking. They have no care about acoustics though so that isn't taken into account to them. I have no data or education for that matter to say which is best acoustically. I did the blow test and that's as far as I am going on that. The Kona which is proven Acoustically came in last on my blow test but that doesn't mean something other then the blow test needs to be taken in to account. I did perform the blow test on printed fabric just to be clear.
I will add more later or try to answer any questions pertaining to the 4 fabrics I have used thus far. With the exception of the Performance knit I am not going to try any of the other fabrics unless someone else does first and convinces me through opinions and photos to give it a try. I feel I have done my part in testing and am quit happy with what I have found thus far so see no reason to keep searching for my own use.