I tried out a Sony a99 with the 28-75 2.8 Carl Zeiss lens. It’s a dream. I also tried a 16-50 2.8 on my a55. Here are a couple of samples of each. All are full size JPEGs – click on a picture to see the full, unadulterated versions. The first two are my camera + the SAL 1650 f2.8 Sony lens….. beautiful. The last three are the a99 with the SSM 28-75mm f2.8 lens. The picture of the lenses is at ISO 6400 and the last picture is at 1600 – seriously impressive.