I doubt that any language gives you 5x the productivity of another language. I don't think I would be 5x slower writing a Back end web code in C than I would in C# and C is probably the worse language to do an API in.
It's not about the language, it's about the batteries-included mindset of rails.
You have your nice web framework in X language and then you need something else quickly is already built-in in Rails or a very powerful feature that in Rails you could just install a gem and call it a day.
I'm working with Express/Node now, I've worked with Symfony/Laravel in php, I've worked with Django in Python, I like them all but there's nothing which can truly replace the speed of coding with Rails.
