DOF, AF systems

I have somehow just gotten the ability to change the size of the images I post in here. I won't ask questions; I like it.

Went out for Italian with some friends from one of my study abroad groups back in undergrad. This is a photo of our appetizer, before it was completely devoured, taken at f/1.6, ISO 800:

I really like this shot (if I do say so myself, ha). I think the colors are good, and the addition of the hand & fork in the background is awesome. The lighting provided some nice highlights, but still fairly detailed "low lights." I'm pretty pleased. The f/1.6 didn't add a bad effect either ;)

This next photo is one of a series of three paintings we have above our couch. I was hoping that the DOF would look a little shallower, but I think I was coming at it from too straight of an angle, if I had shot at an upward angle from even lower, I think I would have seen more blur. But it's still cool. I do think the colors turned out particularly well. Does it have a greenish tint, I wonder? I try to be careful about that. This is at f/1.4, ISO 800:

The DOF looks a lot better on this photo. Also f/1.4, ISO 800:

I know lots of people take this boring "keyboard DOF" shot, but I had to try it.

My main interest when shooting these few shots was to see how the different AF focus points reacted -- I've been reading up on Canon's AF systems (not specifically the one in my camera, since it's a discontinued model). The center point is supposed to be cross-type, while the others aren't. I can't really exhibit these differences in the shots, but I can say that it was usually much harder to lock focus when I was using a point other than the center one.

I don't mind (technique-wise) using the center point every time and simply recomposing, but I wonder if recomposing can actually throw off the focus in some instances.

I'm particularly interested in this because I've become interested in the 5D Mark II as my body upgrade, and it seems that the only big complaint about that body is the "adolescent" focusing system --- still only the center focus point is cross-type (and high-precision).

Supposedly the cross-type focus points are most particularly helpful when tracking moving subjects (birds in flight, sports), which is why people are so excited about the 7D's focus system. But I really, really, really want a full-frame body. I wish the 5D2's AF was just a tad better. Ah well. We'll see what Canon announces in February. Maybe one of the new bodies will fit me better (at what cost?!).