Not exactly the same I know, but I use a 40mm T* Distagon C lens with an Aptus 17 back and it is by far my most-used glass. I appreciate you'd be covering a wider area but I'm delighted with the apparent lack of distortion, sharpness and saturation of images. Even shooting in to the light it is surprisingly good. I haven't yet found the sweetest aperture yet, Anyone got experience on that one? I'm sure the latter lens will be an improvement on it, if budget allowed I wouldn't hesitate. Craig