In focal plane cameras, a big amount of the vibration can also come from the shutter. That's why mirror lockup isn't a panacea.
Worst case: Pentax P67. The shutter itself has horrible vibrations. I sold mine because of it. I've seen that the people who use the P67 (6x7) and don't complain about blur often are the ones who use the huge, ridiculous wooden grip handle, undoubtedly design to hold the damn machine steady while the big FP shutter makes its move.
It's sad really. Extremely sharp lenses coupled with a brutal shutter.
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