You are comparing an older model with a newer model.
True enough, I was comparing a 2010 Sharp to a 2011 Sharp model. The 2010 models was great when I bought it (certainly looked better than the equivalent Samsung at the time), and the newer models are even better. At both times, the Sharp display models at the store held up better to my scrutiny than the Samsung ones. That's what I'm saying.
But my point remains: At the mid-high end of the spectrum I've always found Sharp to be a nicer overall TV. I don't care to test out the low end
There is a lot of "processing" happening on the Samsung TV's that ruins the viewing experience. Play a game with a crosshair in the middle of the screen or any kind of HUD, or watch something with subtitles. The amount of crazy shenanigans happening as moving background gets within an inch of static text/pixels will make your head spin. Sharp TV's don't seem to have that problem.
Either way, Samsung is a massive corporation and while they could surely stand to make some more money, I don't think they're really worried at this point in time.