Would be interesting to compare this lens with the 90mm Apo-Symmar for the Hy6. Same odd focal length, but shorter barrel and less recessed front element. Only goes to 1:2, but is one stop faster. Schneider's Symmar formula has been their success story for medium format and beyond. Wonder whether the Pentax has the same biting sharpness and contrast as the near-symmetrical Schneider. Both cost about the same, but the Schneider can be had used for $3.5K, while the Pentax adds stabilization. In the end, the Pentax is probably a more useful lens because it is faster and has stabilization. Curious to see the results though.