Once again shamelessly stolen from SolitaireD's GF post.

• Single pull: 1
• Triple pull: 3
• Eleven pull: 10

And

• 10 Sapphires per 25 Lens
• 100 Sapphires per Unique Ability
• 25 11-pulls

Basically 1 Lens per 5 mythril spent, 1250 mythril to earn an ability purely from Gacha (but remember, there should be rewards from events supplementing this).

EDIT I didn't really mean to make the post sound as negative as it came off. I actually think as a first release this isn't too bad. Just to temper people's expectations a bit :

• This is not the only way to get these Lens. There will be rewards from events. And you are getting these in addition to pulls you would normally make.
• The biggest gain from the board looks to be passives and stats rather than abilities (no one gets less than 2000 hp, there's also Speed increases which are one of the rarest stats to boost, and even 10 is useful). There's already plenty to get excited about here without looking at Unique abilities. And the materials for these are not gacha locked Although it does take a lot to max a character,
• There has already been an established pattern of making rare resources more readily available as the game goes on, these shouldn't be any different.
• In general terms, Character abilities (pending info about their multipliers) aren't really much better than normal 6*s, if at all. I'm sure there will be outliers (eventually Cloud will finally get a 6* equivalent, relevant ability!), but mostly it doesn't look like we're missing out on too much.
• You still have to hone the abilities. Personally, just looking at the 6* abilities coming up, I'll barely have enough crystals to hone the ones I really like, let alone sparing some for Character abilities.