I only have the Firestick 4K but it plays my library which is 99+% all MKV/HEVC *8 & 10 bit). I've got a test library with many assorted files and this device seems to play them back fine for me. The only thing I don't like about it is that it's WIFI only which is fine for a stick.  My Shield TV is connected directly to ethernet and my MiBox-S use an $12 Ethernet dongle. Both also seem to work fine on WIFI. I'm not fond of the Amazon UI which I think is confusing for finding your
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