Classic aliasing effect, it shows that the 5D2 hasn't got an over strong anti-aliasing filter.
Yes Raw Developer is better at handling this if you get it.
I've seen this also with the 1DsII, but only with a really, really, sharp lens like the 90 TS-E.
I have to say, the resolution on the 5DII is fantastic, the flip side of that detail is that occasionally you have to deal with an artifact like this.
I was noticing on some sRAW2s that I shot that these must be just about the most detailed 5Mp files I've ever seen, certainly more is resolved than I ever saw on the eos 10d, though I have upgraded my lenses since I had that camera.
Another solution at shooting time is to shoot with a very high aperture. F22 may be enough for a bit of diffraction softening to add a stronger anti-aliasing effect and remove these artifacts, effectively like applying a little softening at shoot time. Hard to do sometimes because you often don't notice the effect at shoot time.