An example to show how the pet focus affects the pet. I was a lvl 75 Mage so I could use the Minion of Discord focus.
Lvl 60 Rathe's Sun (Base)
HP 4800
AC 1520
unhasted DPS (with 2 summoned pet weapons) 34.67
Lvl 60 Rathe's Sun (Focus - Minion of Discord: pet power 35, no equipment)
HP 5388 (12.25% increase)
AC 1703 (12.0% increase)
unhasted DPS (with 2 summoned pet weapons) 37.55 (8.3% increase)
DPS increase ~12% between hasted base and focused pets
Lvl 60 Rathe's Sun (Focus - Minion of Discord: pet power 35, with equipment)
HP 6978 (45.4% increase)
AC 1919 (26.25% increase)
unhasted DPS (with 2 summoned pet weapons, haste mask) 46.17 (33.2% increase - mostly due to haste mask)
While the differences aren't mindblowing, especially once the pet is equipped when unfocused, the biggest gain will be from chain casting pets or summoning a new pet in the middle of a fight with no time to give them equipment. The HP difference itself would be useful in raid situations.
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