I love Common Lisp, and as you say, there are many outstanding libraries that Quicklisp gives you easy access to. ABCL hasn&#x27;t been &quot;marketed&quot; enough to the Java community, so it has less mind share. When I last looked at ABCL the Java interop was not as clean as Clojure&#x27;s, so while it was there it felt more clunky. This was at least a year ago, so things are probably better.<p>I use Clojure to implement a portion of a semantic search engine: it is packaged as a REST servlet that responds to requests from a medical POC application. Because of the Java interop I utilize our internal libraries and from the ops perspective they are just deploying a WAR file that plays nicely in their reporting infrastructure.<p>I&#x27;ve been using Clojure since its first release and am comfortable with it and its ecosystem. ABCL is a contender, but I have yet to do a performance comparison, both for native and interop tests. And in reality the only part of Common Lisp I really miss is the condition system. Clojure as an implementation of CL&#x27;s format and I was never a big user of loop, so...