I was just wondering if anyones ever gotten 100% of the coins in any level (except Coldridge Prison, because that's easy).

Myself, I got something like 4000 on the Lady Boyle mission, but never have I gotten all possible coins.

Negative, Ghost Rider. The pattern is full.

Man I've played through the prison several times, pickpocketing everyone and searching every ledge and corner, and I still only get about 70% of the coin.

I got all the coins once in the "Prison" chapter.. On every other there's always about 300-400 is missing, and yes I always check EVERY inch with Dark Vision II. >:-O

Yep, I have completed the game with all coins, runes and charms collected. Even managed to go 20 coins over the max limit in the second mission.
After upgrading everything I've had around 10.000 coins by the end of the game.

Here are mission statistics screens (SPOILERS):
imgur. com/a/XHug0

Sorry but I'm calling lies. In the Flooded District mission, it says you helped defeat Granny, but to do that you need to kill her and I'm pretty sure you also get detected 100% of the time, but it says you weren't detected and had no kills... Also, in the Lord Regent mission, you defeated the torturer? How, on 0 kills? Then we have the mission where you went 20 coins over... And to do this, you would of needed to atleast pickpocket EVERY guard you could to get all of the money, which on a no detecting 0 kills run seems just... impossible.

If any of that is legit, good on you and I'm amazed. But idk.