The CV-125 mm is a macro lens, while the Zeiss you mention, the 135mm APO f/2 is not. These two lenses are not similar and I have used both for years. The Zeiss is better corrected, sharper by far, but it's closest distance is something like 2.62 feet, hardly close. You can put a small amount of extension (K1 ring, 5.8mm) on the 135mm, and the Zeiss is a much better lens. That being said, the CV-125 is a better walk-around/tripod macro lens, but the IQ is not even close, IMO.