Vick,
Well.. I know there are a lot of people on both sides of that DOF issue - and really, I don't mean merely "DOF" so much as I mean out of focus areas (or bokeh).
Basically, how I understand it and view it is the following:
Given - same lens, same aperture, same shutter speed, same ISO
Variable - Camera types (one crop, one full frame)
Constant - Same "Subject Placement In The Given Frame"
I use that last one (Subject Placement In The Given Frame) to refer to the fact that, in order that you're going to get the SAME "image" out of both cameras, you're going to have to either a) move the crop sensor camera away from the subject or b) move the full frame sensor towards the subject. So, if your subject appears in the top right hand corner of the frame in the crop sensor camera, then you're going to have to move towards the subject to get the same image; that is, your subject in the top right hand corner of the frame.
Now, shoot the image - remember, same aperture - the OOF / bokeh should be a bit more pronounced on the full frame sensor at the same aperture etc.
That's how I've looked at this - I know the OFF / bokeh / DOF of the 75 Lux looks different shot on full frame versus crop body digital.. that's the only way I can describe it.. hope it helps somewhat.
Cheers,
Dave