Some of those specs are way off. Both panels are 120hz and only the Sony has local-dimming. From what I have read, 3D on both sets is sub-par with cross-talk. Both have poor viewing angle. The samsung will be a lot brighter. I owned an NX720 for about a week and even with all the eco sensor bogus stuff turned off, it still was not as bright as my samsung. The sound was also AWFUL on the Sony. This wont matter for people with sound systems though. Other than that, the Sony has great realistic picture. The stand is flimsy as hell though.
If I could have gotten the sony for the same price of my samsung I may have considered keeping it. Also if the stand wasnt flimsy and the sound was better it would have definitely stayed home