Sona compared to Nami

Sona's only form of CC is on her ultimate which has a high CDR, it is multi-target

Nami has two forms of CC on a relatively low CDR compared to Sona's, her bubble and her long ranged title wave.

Sona can heals multiple targets with a brief shitty shield

Nami can heals multiple targets and can poke with it, it has percentages

Sona has an ability for movespeed

Nami has a passive for movespeed

Sona doesn't allow her teammates to kite as easily as Nami

Nami has an ability that gives an ally the ability to kite through AA's while also offering more damage

Sona needs time to charge up her abilities for special effects

Nami doesn't require time to charge up special effects

Sona has better poke but that ability falls off into the mid-late game with becoming useless

Nami has poke but not as good as Nami, however her abilities become more and more useful as the game goes on and death timers go up.

Sona is required to get within CC and AA distance to actually do ANY DAMAGE, if she is hit she will be required to heal herself with her massive mana costs while also using her mana to poke at the same time. If the enemy advances on her she will be required to use E as well.

Sona is not required to get within CC distance to poke, she has the safety of her bubble distance and healing distance. If she wants to poke more, she can go into AA distance . . . or give her E to her ally who might have more mobility or greater AA range.

As you can see, Sona is much better than Nami and much better than Nami could ever be. So much better in fact, I believe Sona needs more nerfs. My recommended nerfs:

Q: 500 Mana per use, after the first use her Q increases permanently by 500 more mana, this will make sure she can't poke as hard anymore.

W: Make her heal cost more mana and takes away her HP like Soraka as well. She can't heal herself anymore, because that way, if she takes damage, she can't poke anymore.

E: I think three abilities is just fine, her kit is overloaded as it is. Right Zed? "Bitch one shot me with a mana crystal. Fucking broken."

R: Damage is multiplied by her maximum mana and then divided by her current mana, then use the square root of CertainlyT, using the mathematical formula of DQ and the algorithms of Christianity and Mormonism to get the number 6, what is the devils favorite number? 666, Sona's ult with always do 666 damage no matter what. That is why you should max her ultimate at level 1.