I had the opportunity to shoot with the new lens for a few hours on Monday. It's an impressive lens in terms of size and speed. In addition, I was amazed how quiet the lens was compared to the older version (both were on-hand to compare). Dare I say it was whisper quiet compared to tinny, hunting made by the older version. I haven't used either lens often enough to draw any sort of optical comparison but the new lens was very sharp. Together, the camera and lens combination provide a great entry into medium format at a price that is hard to ignore ... less than the cost of an M10 or M10M without a lens. A double aspherical lens for $1099. That's a lot less than any of my S lenses unfortunately depreciated over the years. Gulp.