Regarding visual changes.
<job> shows what it did before, so NIN99/WAR50
/check shows M.Lv.<lvl> <job> / Lv. <sj lvl> <sj>
/sea <username> shows NIN99/WAR50 (or whatever the combo is)
The status menu shows your job lvl/sj lvl, then current M. Level and Exp, as shown in the previous image
In every case, your SJ is shown at whatever the level is. The only time your mastery level is shown, is in the status window and /check unless you specify different search parameters.
Talk to moogle by maat to unlock on a job that is mastered job points, kill any monster that gives capacity points and you'll get a 3rd xp variant.
Does the KI apply to all mastered jobs, or do we need to speak to the moogle for each mastered job separately? thank you!
Only once. I unlocked it on MNK and EPd on NIN.