I don't think the 110mm is designed to focus that close. The 120mm is a macro lens, right? Macro + medium format must be a recipe for crazy thin focal planes.
While it is the widest aperture MF lens available (as far as I'm aware), the image circle is quite a bit smaller than on lens systems designed for 120 film, so they have quite a bit more leeway on the aperture before the lens becomes enormous. That said, it's really not as big as I would have expected. Looking at the dimensions, it's pretty much exactly the same size as the Sigma 85mm f/1.4, and even a little lighter than it.
It makes sense, as there are only so many FF users who will be willing to pay to move up to full frame, so they might as well try to convert some existing medium format owners with a unique lens lineup (particularly as they'll be able to use their existing lenses with adapters).