There's a reasonable number of people out there who would be very interested in a disambiguation of scale, architecture, implementational wins/shortcomings, etc, about these two cases.
Codebase size? Entropic/organizational complexity? Word style? Environment (custom/standard)? Standard(s) used? Ease of debugging? Testing methodology used?
I most definitely am not literally asking for answers to this set of questions (considering the cases of a bank and an industry that presumably doesn't want to be known for its software) - I guess I'm just being exact in the gist of my curiosity :)
The only interesting illustrative example I can provide is that Mattel once used Forth for its toys (quoting previous times I mentioned this: https://news.ycombinator.com/item?id=21823216, https://news.ycombinator.com/item?id=17755287)
I don't know of any recent case studies.