I have a lvl50 MNK/DRG and i think on a tank and spank fight it looks like this:

MNK>DRG>BLM>BRD

I cant comment on SMN because my experience with that one is too low and the parsers are messed up when it comes to DoTs but they seem very solid too to me.
Now when complicated mechanics get thrown into the fight that cause downtime on melees or a lot of cast-cancelling to the BLM, all of that may change and for example favor a BRD.