This gives you a TOTALLY different look and indeed a much shallower DOF, that's what I have been posting all along, so I don't know were you missed that ?
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Well, you weren't addressing this comment to me, Frank, but I'll answer it anyway.
The larger format
does have the advantage of being able to deliver a shallower DoF. This is not a peculiarity of only MF backs. It cuts across the whole range of different formats.
Those who use P&S cameras struggle to get a shallow DoF under any circumstances. The highly regarded G9 with 12mp on a sensor about 1/20th the area of a 5D, produces about the same DoF at f2.8 as the 5D at f13. There's absolutely no way you could get the same shallow DoF with a G9 as you would commonly get with a 5D at f8, never mind f2.8, shooting from the same distance for same FoV.
MFDBs with a sensor of 48mmx36mm have approximately a one stop advantage regarding shallow DoF with lenses of the same aperture. If you think you are getting a shallower DoF with a 120mm lens on a P21 at f2.8 than you would get with an 85/1.2 on a 1Ds3 at f2, then it's probably because your 120mm lens is 'effectively' sharper at f2.8 than the 85/1.2 is at f2.
If you have been comparing MFDBs of a higher pixel count than the 35mm full frame, then it's almost certain that the resulting image from the DB will be sharper at the plane of focus, which also has the effect of augmenting shallowness of DoF.
If your argument is, MFDB images look better because the available MF lenses are 'effectively' better, sharper etc. than their 35mm counterparts, then that's another point that might well be true and is more likely to be the real reason why you think you always seem to get better results with DBs.
Notice I write 'effectively' better. An MF lens could be equal to a 35mm lens regarding MTF response at various resolutions. However, the larger sensor is less demanding on the lens.
To properly test your opinions on this matter, we would need to properly select lenses for the comparison to ensure that the 35mm sensor was accessing its higher resolution needs at the same MTF as the MFDB sensor.
Put simply, if a 22mp 35mm camera is to equal the performance of a 22mp DB, then the 35mm lens not only has to be one stop faster but about 30% sharper.