It's exceptionally bright F2.8 maximum aperture, is available throughout the zoom range. This is perfect for low light photography or where total control of depth of field is required (F2.8-F32).
Yeah, all those big rangefinders look good on paper, but I can't get into them at all. Hired a Mamiya 7 for a while but it just felt like a big compact. I think a proper SLR finder is a must.
No tilt on any of those big rangefinders either, I'm a ll about tilt at the mo.