I use a 4K Sony 65 XBR 850 as a monitor in the setup in which the 205 will replace a 105. In anticipation, I bought a couple of 4K movies a couple of months ago. But having taken a peek at 4K using Fire TV, I'm not sure I'll perceive much improvement over the already excellent 1080p -- or it may be that the Sony upscales everything to 4K.
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