Sorry i'm not 100% up to speed on the Samsungs, what was the 2011 equivalent model? Did they ever offer an LED full array backlit in 2011? I thought everything was LED edge-lit. Uniformity looked great, viewing angle to me looked really good.
In fact the viewing angle is really what killed me on the 55" LG IPS that I just took back to microcenter last weekend. Everyone raves over how great IPS panels are for viewing angle, but it turns out thats only for color reproduction. IPS panels are terrible for off-axis contrast viewing (the blacks all turn greyish/white from the side). I don't get how anyone can stand this kind of artifact. Personally the uniformity issues across the screen drive me more nuts than the absolute color/black. With the IPS LG, if I moved over 3 feet on the couch a different part of the picture would start to wash out with the greyish blacks, drove me nuts. Samsung looked great, I definitely encourage you check it out at your local best buy, they should already have it or be getting it soon in your area.