I use numerous Nikon lenses from the 1990's including the 180 2.8 and 135 2.0 dc as well as a host of zeiss mf lenses. Both are still made unchanged 25 years later. There is a reason. On nikon digital slr's, in the lower L of the viewfinder are 2 arrows and a circle between them. With auto focus the meatball lights up confirming focus. With mf lenses, I use the scale on the barrel to approximate distance then when focusing, turn the lens barrel in the direction of the arrow, go slightly past the meatball to the arrow and turn back til the meatball lights up. You have nailed focus. It's as fast as a film camera with split screen and is dead on focus. Are your older lenses better? My 135 has 7 glass elements and the 180 has 8. My zeiss 85 planar has 6. Every piece of glass sucks up and reflects light preventing low energy shadow light from reaching the sensor. A 70-200 2.8 has 22 elements. I don't care what you coat them with, they still reflect some and still stop light. And many of the older lenses and newer zeiss use leaded glass that has been stopped because of environmental issues by nikon and canon. Those extra pieces of glass help make the corners sharper. I usually shoot with fairly shallow dof so don't care. Chromatic aberation can appear. If you stop down, that can be eliminated and limit shooting into bright sun or background and is gone in a click or two in post. Or convert to b&w. And for b&w, which is nothing but contrast, all that couble digit glass is like having an 8 box of crayons instead of the 64 so areas of shadow detail become mud. If I can use a mf low element lens, I do. Not where instant focus ins needed, events. But the 135 and 180 are auto focus. With 46 mp I can crop the heck out of a 135 shot so stopped lugging the 70-200 and get way better images. The 135 2.0 dc with it's sister the 105 are considered by many the best portrait lenses. They are plenty sharp and those that only talk about lens sharpness are like people buying wine on alcohol content. I have a voigtlander 58 1.4, 7 elements, and when ever I look at the camera lcd I always say one word, wow. The color rendition is amazing. Same for skin tones with the 135/105. I use a zeiss 35 mm distagon for street as a "no focus" lens. I just zone focus from say 8-15 feet then just point and shoot.