1ds MK II or 5d MK II for weddings?

Being that I already have a 7d and with my current lens line up which of the two bodies do you think would be better? I'm on the fence as both are full frame and have close to the same fps. (which is why i'm making this thread to see what other issues I should consider AF being a big one) ATM it looks like a used 1ds MK II used is close to the same price as a new 5d MK II.

I'm mainly looking for a second body but i'd like to get a full frame body to go with my crop 7d. The main reason is due to resolution and the versatility it will allow for my current lens line up. I feel like the combo will fit each other great as they both meet each other great. Whats the difference in AF between the two?

A friend of mine repurchased a 1Ds II (3rd time he's done this). It's complementing his 5D II. He is a low ISO shooter and loves the AF and lower shutter lag of the 1Ds II vs. the 5D II.

He's tried my new 5D III and thinks that it would suit his purpose better than the 1Ds II.

I used the 1dsII for a couple of years and love that camera. I just sold it to get the 5D3...however, I also shot with the 5D2 and while at high ISO, the 5D2 is better, the 1Ds2 is really really a great camera. It locks on AF as fast as anything out there and the files are really nice, especially those below 800 ISO. I don't usually go higher than ISO 1600, which I usually use the 1d3 for.

Some people don't like the 2 hands controls but I had no issues with it and can change settings pretty fast. If you don't mind the heavier body the 1Ds2 is a great camera.

I picked it over the 5D2 two years ago. But I also knew people who picked the 5D2 over it as well.

Had 'em both...Love the 5dMKII for portraits/weddings.