Sure, plasma have the best picture quality available in SD, but on a HD feed these things look crisper and clearer than plasma.
Crisper and clearer maybe, but the blacks still aren't as deep, neither do they handle movement the same.
As a minor note, OLED is surely the way forward, but LED "backlit" is a nice stopgap until that day comes.
That's like saying a Ford Mondeo is a stop gap to a Ferrari if you already own a Fiesta. All the LED backlights have done is make the screen illumination uniform and more energy efficient, they haven't actually improved the contrast ratio by a great margin.