Carl Zeiss Distagon T* 35mm f/1.4 (C/Y)

A clean Contax/Yashica Distagon 35/1.4 still costs more than most people's whole kit, and the price has almost nothing to do with the speed. It is one of a small handful of f/1.4 wides ever built for an SLR, and the one Zeiss made for the Contax system, but f/1.4 was already the class ceiling when this lens arrived. What you are paying for is the rendering. This lens has the "pop" thing, the way an in-focus subject seems to sit a half inch in front of the background, and it does it at a focal length where almost nothing else does.

The design is a Distagon retrofocus, nine elements in eight groups, including an aspherical element, with a floating group that swings into action at close focus to hold the corners together. That floating element is why it stays usable near its minimum distance instead of going soft like a lot of fast retrofocus glass. Wide open at f/1.4 it is not clinically sharp in the corners. Coma is real, especially on point lights at the edges, and you need to stop down to f/4 or f/5.6 before the corners fully clean up. The center is bitey from wide open, and contrast with the T* coating runs high without going harsh.

There is a version trap you have to know about. The earlier AE model's eight straight blades stop down into a hard star that shows up across the middle apertures, an eight-pointed "ninja star" that edges into out-of-focus highlights in a way some people hate. The later MM version revised the aperture mechanism and renders rounder. If you are buying for the bokeh, and most people buying a 35/1.4 are, hunt down the MM. Either way the blur is smooth and a little nervous at the borders, partly from field curvature you can use or fight depending on the scene.

Who reaches for it: documentary and environmental shooters who want a fast wide that can isolate a face in a crowded frame, plus a lot of people who have moved it onto mirrorless bodies with an adapter, where the look survives the digital sensor better than you would expect. The honest weaknesses, beyond the wide-open corners, are bulk and the 67mm front. It is a big, heavy chunk of metal and glass for a 35, around 600 grams, and it is not discreet.

The lens everyone cross-shops it against is the Leica Summilux-M 35, and the Zeiss has long been the answer for photographers who wanted that rendering without the rangefinder tax. It is a low-light tool first. When you are working it wide open in a dim room, meter in Zone Light Meter at the aperture you will actually shoot, because that last stop and a half of light is the entire point of owning this thing, and you do not want to give it back to a guessed exposure. Buy the MM if you can, accept the weight, and you get a 35 that almost nobody can match.