We are running with MNK and DRG and while our DPS isn't that far off i really have to play perfect to keep up with our MNK and even then most of the times he will score better than me. Our disembowl is nice, but i think it really only shines when you run with two BRDs.

If DRG and MNK are on the same Level in gear and skill he will most likely score better. Which doesn't mean DRG isn't worth keeping, i for a fact don't run out on TP in a full Twintania fight while our MNK needs to keep an eye out for his TP, and even more in Turn 4 where we run with DRG/MNK/BRD/BLM and MNK needs to AOE.
Basically that's been my experience too. Its sad that DRG's moment to shine is AoEing trash in t4. I'm starting to feel really dumb for investing all my myths/allagan drops into my DRG instead of my MNK. Maybe i won't mind as much when they fix jumps.