As far as I know you can still meter but have to stop down, since there is no data about the aperture set transmitted to the camera. Optically most lenses are the same. There was a slight change in the 110/2 around the year 2000 which improved the stray light supression (very slightly) and a significant change that made the 50/2,8 200g lighter but added some inch to the minimum focusing distance as trade off.