Unless you already have a rare Lisp job, or you're retired, spend your time on things more employable.
> Perusing the various search results on 'CL vs Scheme / Racket' had me personally more convinced of CL for heavy-duty "real-world",
CL has more wins on this, but Scheme has, on at least one occasion, been used for large, important, rock-solid stuff, and super-productively. It comes down to the individual programmer(s).
> all the other languages have kept picking up nearly everything once-cutting-edge about Lisp
Much of the relative value of Lisps nowadays is the communities. They're generally made up of people who would be doing this even if software weren't a well-paying job. And there's relatively little BS to wade through (like explodes in all directions around popular employable platforms), since most BS follows the money.