We recently purchased the KD55X9305 HDR 4K set. Excellent picture but the Android co-joined firmware is pants. Several instances of the TV "re-booting" itself while viewing which is a PITA. The input selection is sluggish to come up but when it does respond you get about 3 secs to scroll the list before it blanks or goes to the Android screen. Not exactly what you expect paying £2k for a top of the range set. Can only assume Google/Android have got some sort of deal with Sony, which of course the manufacturer will argue keeps the price down!