I am also a PC concert. Last year I used my HH Diamond status for a status match to Platinum. It took me 7 nights and 5 stays to get the 60,000 points needed to requalify for platinum for this year. The earn rate is significantly better than Hilton, and the burn rate is generally better too. And in Australia, there is so much more choice and availability. Instead of only having one or a maximum of two properties in each major location, you have a choice of several.
Generally the properties are a lower standard that most Hilton properties, especially in Australia. However, as a PC Platinum member you are generally well treated. And if you find a hotel that does not treat their Plats well, then use another property.
I have now used PC properties in Australia, UK and USA and expect t use the CP in KL next week.