We bought the 48" (Samsung UN48J5000). The panel version written at the back is ED02, and it is an IPS panel (PLS). We expect our review to be valid for the 32", 43" and 48". The 50" though, has a VA panel inside, so the viewing angle won't be as good, but it should have a better contrast ratio. The rest of the picture quality elements should be similar.
If someone comes across a different type of panel used, let us know and we will update our review.