I had the 50 Sony w829 after my Samsung 46f6670 failed and I was able to return it.
However the colours weren't great on the Sony everyone looked Ill and I watch a lot of football and the ball would squash when kicked, tried lots of other settings, the picture was clearer, no DSE or anything, kept it a week and got a 46f7000.
Much better, better colour, better motion, better picture.