Being at best buy, the sony has truer blacks and not washed out colors compared to the samsung tvs, go into a best buy yourself and you will probably see it. I saw the 40" sony right next to the samsung 6100 and the 6500 model. The sony had truer blacks and obviously the panasonic next to them had better black s than the samsung tvs also.
Also do note when you watch 3d on active 3d your refresh rates get cut in half meaning that samsung would be 60hz refresh rate rather than 120hz. That is why the optimal tv for active 3d viewing are 240hz tvs.