I don't know how they measure mirror vibration at Hasselblad. All I know is that it feels more prominent than on a Contax in your hands. If you really try to feel what is happening - and where - the action from the Contax seems to be centered in the body, slightly towards the hand grip.
Every time somebody says the H2 has mirror slap someone else says, "I routinely shoot my H2 at 1/4 of a second and everything is sharp".
Maybe, maybe not but I've shot a billion frames with the contax, especially using continuous light and it's much smoother than any camera I use including the Canons and Nikons.
Now I'll be the first to admit I'm not always that overly concerned with uber over sharp, see every pore from 6 blocks away photography and I'll admit that I've only shot an H series camera twice for projects, but the difference in the way it feels as far as mirror slap or vibration or whatever it's called feels like it's double that on the H series, or half that on the contax.
Now the downside is the contax has a small view through the prism (though quite large in a waist level finder) and the view in a H series is much larger (though in my experience the H series prism seems to bend the image which is not exactly in relation to the final image, which kind of breaks my brain.
I've pretty much placed the Contax as a specialty camera, rather than a 2000 frame a day lifestyle advertising camera. It will do 2000 frames a day, but you'll work hard at it compared to a dslr, less hard than most medium format cameras because it does have a 90 degree grip.
What I do love about the contax is the ability to put on a lot of different glass.
This image is with the old Boris Tilt shift lens, at 1/30th of a second and it's sharp where I want it to be, smooth and soft where I want that.
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This image also with the Hareblei 45mm Tilt Shift at 1/30th using modeling lights and an old Aptus 22.
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This second image is shot with the Contax 80mm Zeiss with flash and obviously it's pin point sharp, so the Contax does have a lot of versatility when it comes to glass.
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I even have an adapter to use pentax 6x7 lenses which also have their own look and less bite than the standard Ziess lenses.
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JR