Comment by vindarel
for folks looking for libraries: https://github.com/CodyReichert/awesome-cl/
(I don't know for popularity but my personal opinion is that CL is still unmatched: this level of interactive development + good debugging tools + excellent implementation that compiles to fast machine code + fast startup for binaries + self-contained binaries + stable yet improving language, implementations and ecosystem + connect from a running program + commercial vendors if you need + … such a unique and productive set)
(re. the type system: https://github.com/coalton-lang/coalton/ for a Haskell on top of CL now)
If you look at awesome-cl you may surmise that Common Lisp has a bit of a dearth of libraries, but a glance at OCICL's repositories shows 79 pages worth of libraries, and Ultralisp even claims to have 2,170 projects. So while it's not at the level of C, Java, or Perl; it's nothing to be sneezed at either.