When I did this flight last year, it was a full lunch service in J. This also means that there is a full bar service available.
My flight was delayed around 45 mins. The flight is DXB-BKK-SYD-CHC, so delays are certainly possible.
The EK lounge in SYD lounge is great.
The F seat in the middle is a good seat to have, since you are the only passenger on that side served by the FA on that aisle, so s/he does not need to lean across you to serve someone else. If you are travelling alone, that is.