Not sure if this has been covered, but I decided to do some math to end the Arka IV vs. Tefnut + Shield discussion once and for all as I had seen some shouts in Port Jeuno that motivated me to do this.

Note that this does not cover cure casting time- on the shield, this is pure potency/skill/mnd/vit (barely) comparisons as I am not a Tefnut+Shield user and I can cap cure casting time- in gear without that.

Quote Originally Posted by Staff+Grip Set
Arka IV (24% potency)
Curatio Grip (3 skill)
Mana Ampulla (MND+3)
Iaso Mitra (10 skill, 11% potency, 10 MND)
Phalaina Locket (3 MND, 4% potency)
Orison + Roundel Earring (7% potency)
AF3+2 body (+20 skill)
Healer's Mitts +1 (7 MND, 15 skill)
Haoma's Ring (8 skill)
Sirona's Ring (3 MND, 3 VIT, 10 skill)
Tempered Cape (4 skill, 4% potency)
Bishop's Sash (5 skill)
AF3+2 pants (7 MND)
Zenith Pumps +1 (6 skill augment)
Total: +50% potency, +81 healing skill, and +33 MND (Not going to factor the VIT as it is the same in both sets I thought up)

Quote Originally Posted by Tefnut+Genbu's Set
Tefnut Wand (15% potency, 10 MND, 5 skill)
Genbu's Shield (5% potency)
Mana Ampulla (MND+3)
Iaso Mitra (10 skill, 11% potency, 10 MND)
Phalaina Locket (3 MND, 4% potency)
Orison + Roundel Earring (7% potency)
AF3+2 body (+20 skill)
Augur's Gloves (7 MND, 5 skill, 4 potency)
Haoma's Ring (8 skill)
Sirona's Ring (3 MND, 3 VIT, 10 skill)
Tempered Cape (4 skill, 4% potency)
Bishop's Sash (5 skill)
AF3+2 pants (7 MND)
Zenith Pumps +1 (6 skill augment)
Total: +50% potency, +73 skill, +43 MND

Differences:
Staff/Grip has 8 more skill
Club/Shield has 10 more MND

8 skill > 10 MND

And that's that. If that was discussed earlier in the thread already, disregard, but I felt this needed to be shown to prove that Tefnut+Genbu's in ideal situations is inferior now. It was to an extent slightly better, but now it isn't even with the best gear possible.