those detailed numbers you speak of do in fact, exist. I remember some specific Flashcache "before and after" statistics and Performance Advisor graphs that were circulated by the Suncorp storage team showing how much the Oracle and Claimscentre application had benefited. I suspect that the Suncorp guys simply choose not to share this level of detail publicly. We (NetApp), would love them to, but must respect their choice to remain private with much of their data.
How do I know? I was the SE lead on the Suncorp account for the first few years and remain very close to the team that continue to work with them.