Looks like a good, well documented benchmark. Was well worth the read. Probably even more if you're more into Java than I am.
What's surprising me is, that PostgreSQL often was 'only marginally slower' compared to MySQL. First, I thought: wow, MySQL must have improved. But later on, I've read that they tested the MyISAM storage engine. Thus, I'm surprised that
a) they perform only marginally better, and
b) that the results are so close and similar.
I can only conclude, that PostgreSQL does a very well job in keeping the costs of consistency very low. ;-)