Nice shots, Marc.
I, too, recommend the combination of 5D (and 24-105 IS L) with DxO. I haven't done anything as drastic as removing the AA filter, but I routinely expect to do some capture sharpening and contrast enhancement, even after running DxO. I generally do my sharpening in PS, because my previous raw converters haven't done a great job of it.
But I think I'll try doing some in DxO.
Rejcd: Try Marc's suggestions. If your AA filter is still in place, I'd try several different conversions, using a variety of degrees of sharpening to see what works best. Only if you can't get a good image that way, start worrying about your lens or camera.