Hisense 75R7 vs Sony 75 X8500F (Demo)

Hi Guys,

As title, what should I pick?
R7 is about $2100 brand new but I see 8 series Sony (Demo) for $1950
I notice Sony is IPS which has bad contrast but better resposne time and view angle
Is there any other major difference?

Also any tip if I add in Samsung NU7100 in competition for $2299?

I am guessing X8500F > R7 > NU7100, but as a demo unit not sure if I should get it, mighty ozbargain please share me some light~

Regards,
Tom