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For a general understanding of format equivalence, see Format-Equivalent Depth of Field and F-Stop. For specific information on full-frame 645 equivalences, see PhaseOne IQ4 Format Equivalent Focal Length, F-Stop, Depth of Field.
The Schneider Kreuznach LS 150mm f/2.8 is a medium telephoto lens stated to be optimized for portraiture. It is equivalent to a 101mm f/1.9 as compared to a 35mm full frame camera (long dimension of frame).
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These systems are hugely expensive, so make the right choice for your own needs (full frame vs medium format).
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