I don't remember the Westin Breakfast having hot food, but we stayed there for 5 nights as a family of 5, and I never remember any of the family members complaining they didn't have enough for breakfast at the Club. I seem to remember hard boiled eggs, yogurt, cheeses and other international breakfast fare, plus the usual bread/pastries/etc.. And a Neopresso machine for my caffeine addiction.
The evening drinks/bites was even better -- fully complimentary wines a really nice array of appetizers. Wonderful service too, morning or evening.
We walked to the Harbor and also to Darling Harbor from there -- we didn't take a single taxi in Sydney, except to/from the airport.