I love this kind of stuff. The similarities and differences of programming languages is something of an obsession of mine.
In my free time over the last several years I've been working on a chrestomathy that collections solutions to Project Euler problems in various different languages [0]. I'm currently up to 39. It's certainly far from "every" language and in most languages I've only written solutions to the first handful of problems. I've learned it's hard to not learn a lot about a language if you do the first 7 or so problems in it.