I was disappointed with 747 PE last month, day flight SYD-HKG, with a recliner in front for entire trip. Worse was 34AB between toilet & galley. I wouldn't do it again unless 36JK available, particularly if overnight.
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Was refurbished, 747 PE 2-4-2 config and seemed crowded. 36 seats, 1 toilet.
But 36JK bulkhead seats are great if available (otherwise I'd avoid). With a recliner in front for the entire trip, it was difficult to exit from 37JK.
A380 PE is only 2-3-2 config. I've only travelled old A380 configuration (PE to LHR) & that was more enjoyable than the 747 PE to HKG.