ok - here's my two cents:
i replaced a 44mm zeiss conquest w/ a 50mm elite 4200. and never looked back. the elite 4200's are wonderful.
zeiss is a great piece of glass, but you absolutely can't beat the bang for the buck of the 4200's -
it is just as clear and brighter image (i know that the 6mm dif in obj had something to do w/ it.)
i am very impressed w/ the rainguard coatings on the elite 4200's > not for the moisture thing, but for the image
clarity and brightness.
good luck. either would be fine - but i can attest to both, you could do the 'pepsi' challenge and probably not tell a difference.
only the UBERtrained eye can.