The fountain in Hyde Park usually runs all time of the day and this particular morning it didn't run and I got a great reflection from the calm water from the Sydney St Mary's Cathedral. Only calm water is where you could get great reflection.
If you want to photograph similar photos then I suggest you wake up early for the sunrise before they start to turn on the fountain. There's also another water feature on the west side of St Mary's Cathedral as well. I haven't taken any photo of during sunrise yet but you could try your luck there.