I am curious as to why most of the posters in this thread have not mentioned noise issues with the A900? In early rounds of reviews including comps. with D3 etc. - the issue of noise always came up. I noticed that the "one year later" poster...said nothing of the issue. I love the feel of this camera in the hand-perfect, and like the Zeiss lenses...but am considering either the D700 or D3 for next cam. based on noise complaints.
The A900 has the best color in 35mm, and a dense CFA that requires more gain amplification because less light is reaching the sensor. So, it's a color trade off for high ISO. Granted, the A900 is still certainly usable at higher ISOs (if you don't use Adobe, outside of LR3,) and performs better than any aps-c camera at high ISO when compared at similar output sizes.
As for the Zeiss lenses, we can compare them all day to other lines and decide which has better sharpness, CA control, distortion, etc, but that really isn't what it's about. Here is a certain look that is relatively consistant across the Zeiss line, and some prefer it.