I also did a benchmark among apache-2.63, lighttpd-1.4.19( PHP in FastCGI with eAccelerator), lighttpd-1.4.19( PHP in FastCGI without eAccelerator):

It's here: http://admon.org/uploads/doc/Apache-Lighttpd-with-FastCGI-Benchmark.html

Additionlly, three types of files are tested:

1, Dynamic PHP files with single command phpinfo();

2, Median size HTML file, 24KB

3, Large size JPG file, 188KB

Details is here