I looked at the CV21 threads/images/reviews a lot. Looks like a great lens and the combination of IQ & size nearly won me over. In the end, though, I like what I've seen from the D 21 more and felt that it might bother me if I went with the CV21 and wasn't *totally* in love.
D21 =known goodness.
CV21 = early adopters risk
I'll gladly take the risk for the size advantage, and it does seem very respectable with my initial impression. Maybe not fully Zeiss, but pretty nice wide open. Can't wait to put it through its paces, a pleasure to use and pack, images feel very high quality so far.
You should try the CV lenses, the 35 F1.7 Ultron is very Zeiss like.