Today, I officially set the wheels in motion to achieve this objective.
After recently being in contact with the manager of the store from which I prefer to buy, I visited the store today and paid a deposit on the lens.
The good news is that Canon Australia has two in the warehouse, that mine has already been ordered by the retailer, and that it should be available to pick up this week.
I am looking forward to exploiting the capabilities of this lens to the fullest, and it will bring my lens lineup to the state I desire: all primes in the widest apertures currently available.
Naturally, this means that my long-serving (over ten years now) and excellent Canon EF 70-200mm f/2.8L IS USM will be departing, but being in near-mint condition, I am sure it will very quickly find a new home and serve a new owner for years to come.
In terms of gear acquisition and de-acqusition, 2017 has been a rather dramatic year, with two new lenses purchased, three long-serving lenses sold, an entire collection of filters sold, and a new set of filters acquired.
I think it is time for a rest.