Alas, outside of crazy hacks like this one (https://www.youtube.com/watch?v=hzTVe6aVgww), there's no way to use the 5K iMacs as an external display :(
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Sad that Apple abandoned Target Display Mode with the Retina iMacs, though pre-Retina models support it (2011-2014 via Thunderbolt, 2009-2010 via Mini DisplayPort.)