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after several monthes with 3 lenses covering 200mm, it is hard to make a choice. yashica 70-210, zeiss 80-200 and zeiss 200/3.5 are good. usualy i do not like zoom lenses but the zeiss one is sharp. the 200/3.5 have a nice background blur and i am very surprised by the sharpness of the yashica one for a very low price.
the minimum focusing distance of 1m is good for proxyphoto with the CZ 80-200.
I would recommend the Zeiss 80-200/4.0. I used it in the analogue days and later with an Olympus E620 and an adapter. Great lens. The 70-210 is an older designs and the Yashica versions not on par with the Contax versions. Since the Contax/Zeiss 80-200 is not that expensive on ebay, I would go for that.
Be aware that it is very long. I had sometimes a hard time to get everything in my camera bag. Also the zooming is something you have to get used to.
I still have my Zeiss 80-200, but I converted it to M42 mount to be able to use it easier with different brands.
zeiss lenses are very sharp. the 80-200 zeiss zoom is the good choice. the CZ 200/3.5 seems to be sharper in my opinion. the yashica 70-210mm is a good bargain because is very cheap.
indeed, the CZ 80-200 is very long but it is not an heavy lens.
I find it a pity that I can not use my Contax 80-200 on my Nikon D7100.... Since the announcement of the ne Fuji X-T1 I am thinking it might be time in late 2014 to switch again away from Nikon. There are so many lenses you can use on a Fuji X-body with an adapter. And the native lenses are all new designs for "DX".