EDIT: I do see that Jorge made additional posts (above) to attempt some comparison between bitcoin and various other fiat payment systems. I remain of the conclusion that his comparison are inadequate largely on the basis that the security of bitcoin is continuing to evolve. Surely there are currently some security issues with bitcoin - yet Jorge seems to be overstating them in order to spread FUD about bitcoin. I look forward to continued developments in the bitcoin space to make improvements on security b/c certainly, it remains a concern for everyone if a security issue develops or involves an individual user, then the irreversible nature of a transaction can be very problematic if one's coins get in the wrong hands.
See this: https://freedom-to-tinker.com/blog/randomwalker/bitcoin-hacks-and-thefts-the-underlying-reason/
EDIT: this article suggests that Bitcoin security is much harder to do than "real-world" security, because the expected disutility of punishment is way lower. I expect software/communication security to evolve more or less uniformly. [Don't forget the first goxxing of Gox, when they were sending passwords with GET, unhashed. Announcement thread from 2010, second page or so. Unbelievable people still kept money in Gox with that first impression]