perl5 has more explicit and reliable scoping and more flexible and powerful OO than python or ruby, and has had for a decade now. If other languages would actually take the lessons, I'd've switched.

Recent javascripts have 'use strict' and 'let' (perl5's 'my') but the errors are at runtime, not compile time, so in terms of maximising productivity perl5 is still my preference - though ES6 is almost an acceptable perl5, and I'm working on some libraries to bridge the remaining feature gaps since apparently nobody else actually wants working OO and proper DRY.