I literally just moved the vast majority of my finances from CommBank to ANZ, after opening an everyday account with the latter to test Apple Pay. I was hooked after the first day, and I kept funnelling more money into the ANZ account because I was using Apple Pay more than expected. Luckily I pay for most subs/bills via PayPal, so I didn't have to worry about changing too many billing details (payslip and telco bills were the big ones). CommBank was my first "personal" bank (I've been with them for over 10 years, and I'm turning 21 this year). Disappointing!
I recently read an article where CommBank's CEO said something along the lines of that they'll "happily welcome Apple Pay when Apple allows them [unfettered] access to NFC in the iPhone", which was the nail in the coffin for me.
I couldn't be bothered waiting for the other Big 3 to get something after they're repeatedly told "no". Albeit, they're probably not used to hearing "no"
Funnily enough, my sister also started using Apple Pay recently (she's been with ANZ for a while) - unprompted by me. She found it cool, and even discovered the lock screen access feature.