Have a stack of VA points that I could convert to Singapore points and do an upgrade?
This won't work, upgrades are only available using Krisflyer points from the two most expensive economy fares - Y & B class - an $850 fare is not going to have that opportunity.
I did my first UA international flight last year - Shanghai to LAX - on a 787.
Seating - legroom was OK, width was quite cramped - as per most airlines economy configurations 3-3-3 in 787. I was however lucky, as I was, along with three others paged (35 mins before departure mind you!), as a "last remaining passenger" to board. I saw one of them ahead of me, the other two just behind me, and therefore went straight to the bank of three empty seats free towards the back of the plane, on a fairly full flight. Three seats to myself was great, although an empty seat beside me would have been enough. They were selling upgrades to economy plus for around $240 USD one way, which is i think about what it costs for SYD-LAX. Also were selling onboard for similar price, but certainly didn't interest me when buying ticket as only centre seats left, and I had aisle allocated.
IFE - Good options, although somewhat limited range compared to the likes of SQ & EK, and of course as you would expect, no real international selection, all US content.
Food - good quality. Quantity rather small. Service was hit and miss with the usual mix of attitude from one FA, and excellent service from the other (almost apologetic for their colleage). Didn't worry too much about beverages in flight, as couple of bottles of water and a can of soft drink accidentally fell into my backpack when I walked past the fridges in the lounge
. But I was glad that accidentally happened, easier that way.