Does anyone have any figures on what regular banking systems use for accepted/official currencies? I feel like this has blown up so much that it makes sense to compare and contrast.
That's assuming that a transaction comparison even makes sense, which it doesn't really because:
Bitcoin is not a currency. People use it as a way of getting rich, which they could also do with any other currency by just having a limited number of numbered paper bills, some guarantee that no more will ever be printed (e.g. agree that nobody will use a bill number higher than 10 million), and publishing on a forum who owns a specific bill number. It doesn't need proof-of-work to function as an investment scheme.