Is there any issue with loots since last patch?

[LastFireAce]

This is a legitimate concern and it is potentially only going to get continually worse under the current system in dungeons and raids as more and more jobs are introduced. I'm not going to sit here and do the napkin math but since ARR has launched I believe there have been a total of 6 new jobs (Ninja, Dark Knight, Astrologian, Machinist, Samurai and Red Mage), so the percentage chance of seeing a piece of gear for your job has gone down considerably over the course of only two expansions.

Dark Knigh share Armor with PLD,WAR. So outside Weapon no the drop rate did no change
AST with WHM,SCH so no it hasn't changed the drop rated.
MCH with BRD.
SAM with MNK
RDM with BLM, SMN

So the only class the change the drop rate was Ninja like 4 years ago.