hey... i'm just curious as to the personal experiences some might have with the 50 f1.7 vs the 50 f1.4 zeiss lenses for contax 35mm cameras. as well the same question for the 28 f2.8 and the 28 f2. i have the opportunity to buy the 50 f1.4 and the 28 f2 for pretty good prices. i already have the 50f1.7 and the 28f2.8, but would consider switching and selling my other lenses if the results are better. thanks....jordan.