(Disclaimer: CL weenie) A decent and balanced writeup IMO. But it should really have contained the following:

Warning about the issues that come with ANSI CL's frozen spec (threads/sockets/unicode/extensible sequences/gray streams/etc... as extensions with a varying amount of support with compatibility layers often available to write portable-ish code, "bolted-on" CLOS never fully integrated) and its various rust spots, not just the good points.

Mention that CL has provisions for gradual typing (with limits) which are exploited by SBCL.

Scheme, obviously, along with the same warning as CL about pain of writing portable code that interacts with the OS (does it have compatibility layers like CL?) amplified by the R6RS vs unfinished R7RS-large mess.

A few words about the build system/third-party packaging situation and alternative implementations.