I thought about Zeiss but I was really unsure because they're larger and they're not the 39mm filter thread. On paper, the only thing Zeiss has going for it is an additional stop. I care about build and optical qualities too but it is hard for me to come up with a conclusion based on internet readings. Some say CV is just as good as Zeiss in both regards but most people say that it isn't. I don't know. Truthfully I prefer 35mm/50mm and I just want to explore the 21mm-28mm focal lengths so I figured that I'd go with the best value and just "upgrade" to Leica/Zeiss in the future if I feel compelled to.