Sigma 70-200 mk1 and mk2 differences?

Hi
I assume you are asking about the DG mki and MKII and not the original IF non DG?
The MK1 DG had a few front focus issues and the MKII was suppose to help eliminate them.
If buying a used lens get the MKII as it more likely not to have front or rear focusing issues and if anyone can tell the difference in IQ there a better man than me as i find them the same.

If however you mean MKI as the IF non DG lens then the difference is the lenses are not coated for use on a digital camera, the body has not got the new black coating(probably better as the coating peels) and obviously it is a much older lens and i feel has a yellow look to the colour cast.
 
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