Goeiedag Turboman, alles goed?
Actually, I am just going on my limited experience here. I also have a samsung 50a550, and I used to calibrate it to about 40 ftl, and it gave very nice "pop" on the image. That was with two point grayscale, a pretty good cms for primairies and secondaries, but no gamma. Now I have the vt50, with 10 point grayscale and gamma, and a good cms too.
However, the THX and all other presets only have two point crayscale and nothing else. The ISF presets are fully loaded. The THX brightroom preset gives 51ftl, but I cant raise the ISF preset higher then 23 ftl. So i get to choose between enough brightness (30 to 40) inTHX but only two point grayscale, or every control possible with only about 23 ftl. The pop on the ISF is amazing,as are the colors and dark scenes. But even with a completely darkened room with ambient lighting behind the tv, its just visibly too dim.
So my plan it to eventually get the radiance mini3d and fully calibrate the THX mode with it.