Haven't heard the Mullard EL84 but have a pair of the re-issued Mullard El84s. They sound fairly good, not my favorite EL84 but a good solid tube with a clean, defined sound.
I concur with your perspective of the GL KT77. I like them a lot but they do lean toward clarity and imaging and away from warmth. My vintage USA Fat Boy 6CA7s are warmer.
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