Sony runs Android TV, Samsung and LG do not. So they require different apps with different coding that the developers have said isn't worth it for now. Android TV has more platforms so was preferenced.
I just bought a new tv Sunday and was tossing up between Sony and Samsung. Picked up a Sony based solely on it having Android TV (and built in Chromecast). I've just been watching the JLT on there and it is flawless, 1080p, better than my iq2 which I think maxes out at 720p. Tested some live streams too and it was perfect.
Native tv app is still going to be less stable than Appletv or the like and I had it crash a couple of times for me yesterday when testing out but I assume there bugs will get ironed out. Appletv works perfect too, 1080p and can't tell the difference between this and Foxtel. Still not 100% sold that it'll stand up once the real stuff begins (I'm picturing an Optus/world cup deal for Rich/Carl and Coll/Geel) but as if now I can't fault it.
I should mention I'm on Bigpond cable 100mbps so those on adsl probably won't have the same experience
The only downside is no NFL On demand by that just gives me an excuse to buy game pass :)