2:51:58nirnamalot of thing still be written in C89, I guess you can consider CL standard fairly modern
2:57:07aethnote that CL didn't stop evolving just because the standard is set in stone
2:59:09aethUnicode as the default char-code/code-char, UTF8 as the default format for reading/writing files/etc. (although something like UTF32 might be the actual internal string format), metaobject protocol, bordeaux-threads, cffi, gray streams, extensible sequences, package local nicknames, etc.
2:59:31aethMost of the latter stuff have trivial wrapper libraries or are the names of such libraries (e.g. closer-mop for the MOP)