I am curious about this as well, not only about ZIP1 compression (which is definitely the global standard for most VFX houses from my experience), but especially in regards to the EXR2.2 DWA compression schemes.
From my understanding, EXR’s written with anything else but uncompressed, PIZ and B44 are not necessarily ACES-compliant, but will still ‘work’ and store the required information as long as they are 16-bit half float (not 32bit(?!)). I am wondering if those restrictions were imposed to guarantee realtime-playback, but then, on the other hand, PIZ does not really fit in… but those are just assumptions, and I would like to second Mike’s question and extend it to include DWAA compression as well.