Yes the Zeiss Ikon has a bigger and nicer viewfinder but apparently the RF contrast isn't as high...only an issue at night I think.
Ohhh nooo not at all! The Zeiss Ikon finder comes into its own at night. It can practically see in the dark. Definitely a shade better than my Leica MP, at least to my eyes. The focus patch can "disappear" if your eye moves off center (which is not hard to do thanks to the huge eyepiece for an RF camera) but you soon get used to keeping your eye centered. I don't even think about and center my eye subconsciously now.