I am newbie too with a Contax IIIa I purchased a few months ago at a camera show in the suburban wilds of Toronto. I did not come with CZ Sonnar but what I think is a Jupitor 50mm f2 from our friends in the Ukraine. I shot one roll of Agfa APX 100 and on the whole I am very happy with the results. I would love to get my hands on a CZ 50/1.5 and a 35 mm lens. I have been pricing the lenses out and there is a price spread that can be best described as a gulf.