The lenses in the examples are all for full frame mirrorless cameras, and you can see that IS is attached from the lens configuration diagram. The 24-70mm F2.8 is a standard standard zoom, but the 28-85mm F2-2.8 has specs that we rarely see.
The total length of 28-85mm F2-2.8 is 138.5mm excluding the flange back of the RF mount, so it seems that it fits in a practical size. This will be a lens more suitable for portraits than the standard zoom of Daisangen.
[Publication number] P2019049645
[Publication date] APRIL 4, 2022
[Patent application title] Optical system and imaging device