There are different Yashica's, DS, DX, DSM, ML....and more. I have both 1.7 and 1.4, I think both are DS.....Perhaps I can put two shots for you tomorrow to compare....As for recommendations - I really like the Olympus OM 1.8 and 1.4 and I think the Pentacon Auto/Electric 50 1.8 of later versions are very good - and very comfortable to work with. I have all three of those too, he he. I had the aperture rings converted to step-less and it's a pleasure. Also - the pentacon focuses at about 0.3m, unlike the standard 0.45