Comparing Python to various other languages:
Full Treatments:
External Articles:
Several: Lutz Prechelt's article [http://www.ipd.uka.de/~prechelt/Biblio/ An Empirical Comparison of C, C++, Java, Perl, Python, Rexx, and Tcl for a Search/String-Processing Program] is a little old ((c) 2000), but it is REAL RESEARCH, comparing productivity and program performance for 80 different implementations of the same requirements, in 7 languages.
Several: Guido's essay on [http://www.python.org/doc/essays/comparisons.html Comparing Python to Other Languages].
Perl: [http://www.linuxjournal.com/article.php?sid=3882 Why Python] Eric Raymond describes how he discovered Python, how it compares to Perl, and why he was impressed.
Perl: [http://www.python.org/doc/Humor.html#yoda Python vs. Perl according to Yoda] (humor)
... please add more!