From memory since I was there in January, the MEL club is certainly a notch above domestic UCs with somewhat upgraded food offerings: I recall small sandwiches and bite-sized desserts in addition to the usual snack offerings. The lounge was quite crowded when we were there, though everyone appeared to be able to find seating and the staff handled it great - this was the height of the summer and the day after the conclusion of the Australian Open so likely close to peak traffic.

The SYD lounge is very large but also comfortable - self-serve beer/wine and espresso maker with a hot buffet of breakfast/lunch items.