Hi,
IMHO, get sony KDL-40EX720 quietly and save yourself some headache. i have been doing rounds of showrooms
from past some days and i will sum up few points for you here :
1. if you intend to game, samsung is a no-no. some sets of it, esp. the 6 series have reportedly high input lag.
2. the EX720 handles the motion flow much better (true motion flow) than samsung's. if you demo them both side-by-side,
the samsung one's looks kind-of fake since its an emulation which is not true 100Hz of refresh rate.
3. to me, samsung (esp D6600) had a heavy blue tinge to the PQ, which MIGHT be corrected by some internal settings, but i dont know.
4. the smart tv features are 'bloatware', means most of those are useless, and many others arent available to us in India here. you are
going to be unnecessarily charged for them.
5. some users have reported samsung's panels going kaput within/after 1 yr of use. big pain !
6. samsung has panel lottery policy. that is, you dont know what panel you're going to get unless you've bought the TV, though some say 5/6 series
has AMVA panels in India here, but not sure. with sony, you are guaranteed to get the highest quality VA panel, ie, SPVA.
This is my opinion. but i strongly suggest you to go and take a demo twice-thrice before making a purchase, and take along with you your console/movie in pen-drive for testing.
keep us posted. will be glad to help
P.S. -
If you're gonna buy the sony one, a decent HD media player is highly recommended !