Originally Posted by
Braindwen
Not that your conclusion is off, but that's some faulty reasoning right there. To illustrate:
"Dodge avoids taking damage. Block mitigates said damage. Both only account for physical damage intake so it should be fairly obvious which is better.", where Block is the superior one for shield classes. 100% reduction (avoidance) isn't always better than partial reduction, it depends on the chances for each to happen, among other things.
That said, dodge is still above mastery, albeit very slightly for normal modes (should be a bit more of a difference for hardmodes). I really don't know where the OP got the idea that 2t13 lowered mastery's value, like earthwormjim said it's the main reason they're so close right now.