Perhaps miracles do happen. Although the recently revealed Xperia Z5basically has the same specs as the Xperia Z3+/Z4, it might not have one of its critical defects. Preliminary assessment has indicated that the Xperia Z5, despite having that same problematic Qualcomm Snapdragon 810, actually fared better in the heat department, lasting 10 minutes while recording 4K video. It seems that the magic is thanks to Sony using two heat pipes instead of one to better dissipate heat away from the processor and help keep things cooler.
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https://www.slashgear.com/sony-xperia-z5-using-dual-heat-pipes-to-curb-thermal-woes-07402240/