I hate to say this, but if you can afford the miles, it may well be better to try the QF option since their LAX-SYD flights *should* mostly have their new J (skybed) product installed, which is likely better than the UA seat as it promises a bed-seat rather than UA's C seats. However you might find that availability is more difficult on QF since they don't usually offer a lot of capacity for award seats on such a route. However, good luck!

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RichardMEL, UA 1K
A Star Alliance Member.