Lua itself can stand pretty well, especially with LuaJIT2.
That said, I'm starting to learn Lisp right now (Clozure/OpenMCL), and coming from primarily Lua development in the last two years, it seems much less like the leap many play it out to be..
Instead, it has seemed more like simply stepping from a clean, compact room into a large, similarly clean and smooth room but with depth you hadn't imagined before.
Well, that and learning Emacs compared to ST2 is a bit of a step at the same time.