People who have not played all the jobs need to stop talking out of their asses like they know what they're talking about. And comparing your parse with someone else's is not a good comparison, due to differences in gears and skill that you may not be able to account for. Comparing your own jobs to each other will give you a better idea about the gear difference, skill difference (base on comfortable you are with each job, etc), and general potential of each job. It's helpful to compare the highest reported credible DPS for each job but there are many factors you have consider there as well.

Anyways, I have not played DRG for a long time so I'm not too sure how they compare but I have noticed the DPS of the DRGs I know have shot up significantly since the buff. Not quite a high as NIN but pretty close, I would say they're probably comparable to MNKs now. However, since DRG has numerous advantages over MNKs (such as piercing debuff, higher burst, more consistent damage, simpler play-style) there's no point in bringing MNK if DRG can do the same overall damage.

I play NIN and MNK a lot and I can safely say, there is no point in bringing a MNK when you can bring a comparable geared NIN. Not to say MNK can't get the job done, they're actually not that far behind, but if you want optimization, NIN can do it better. Then there's the fact that MNK and BLM are encumbered by mechanics way more than other DPS and have a higher mechanics-related learning curve.

I have not played PvP in a long time so maybe this has changed but MNK were absolutely HORRIBLE in PvP. I don't even want to talk about it.