I would wait for 4k, as the HDMI 2.0 standard was finally finalized to support 60Hz (and ends up being a firmware upgrade for the Sony / Samsung pre-existing ones).
At the moment 4k is irrelevant in terms of content, but if you are keeping TVs for more than 5 or 6 years the situation will probably be completely different. And the price drops have been coming in very quickly, with reasonable brands already in 3k territory.
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