Nancy -
The 90 CV is tiny, very well made (made by same manufacturer as Zeiss's 100/2, etc), buttery smooth focus and if not true APO very, very close - as good (or better) as any of the Leica R APO glass I've owned over the years on digital (e.g 100/2.8, 90/2, 180/2, 180/2.8, etc). The rare CV 180/4 APO (also owned) may be a hair better in terms of CA control and while the CV 125/2.5 macro APO (owned as well) has great image quality, I never loved the mechanics - too long a focus throw (for me) for anything but macro work.
Put it this way, I compared a CV 90 APO years ago against a Leica R 90/2 APO that I owned, both mounted on a 5D. I sold the Leica a week later. I could not tell the test shots apart - and the CV had better CA control. The 90CV is one of my fave lenses on both Canon and (now) Nikon and lives up to the demands of the D800e easily. The images have great 'clarity' or transparency due to color control.