1) Landscape: Canon 16-35mm 2.8L MKII
2) Portrait: Canon 35mm 1.4L
3) Children: Canon 70-200 2.8L IS
4) Macro (would you choose a short or long macro lens, e.g. 60mm or 120mm) No macro lens
5) Architecture: Canon 16-35mm 2.8L MKII
6) Water scene: Canon 24-70mm 2.8L
7) Sports + Action: Canon 70-200mm 2.8L
8) Animals + birds: Canon 70-200mm 2.8L + 1.4 Telex
9) Low light or night photography: Any from my kit.
10) All purpose photography: Canon 24-70 2.8L