Not sure if Sprint has released the update, but my HTC One M8 got the 5.0 Lollipop update a few weeks ago on Verizon, so it is compatible.
One word of caution, as I have seen with a few phones updated to Lollipop, it causes your battery to drain quicker than 4.4.4 did.
Samsung - Galaxy S6 edge with 64GB Memory Cell Phone - White Pearl
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