My point is what you look for in a lens is subjective, but here is what I like:

• Bokeh
  I started of as a painter (and still look upon myself as one eventhough it has been ages since I painted anything). I want soft transitions, a painty feeling. Bokeh is very important to me in a lens. I often try to use the contrast between soft and sharp.
  
  

  Butterbokeh of tha Auto-Takumar 85mm/1.8

• Build quality
  My theory is if I like the feeling of the lens, holding it and looking trough it, I will take better pictures becuase I can feel comfortable with the tool. I like the feeling of the lenses I keep, if I don’t like the feel I usually sell it.
  
  

  Yashica MC Zoom 35-70mm 3.5-4.5

• Speed
  A faster f-stop make the viewfinder brighter. This is important if you use manual lenses like I do, brighter viewfinder means easier to focus. But sometimes there can be other reasons – some of my f3.5 lenses give a clearer, brighter viewfinder then others.
  
  

  Yashica ML 50mm/1.4

• Colours
  Contrasty, saturated? Actually I can see the use of most qualities here for different occasions, but I tend to like saturated colours or black and white photographs with good contrast.
  
  

  Colours of the S-M-C Takumar 55mm/1.8

• Sharpness
  Ok. Sometimes I want to make a sharp image to, or at least a part of it.
  
  

  Waterline with Yashica Zoom

• Peculiarity
  Some lenses you just got to love. Like the Industar 50-2, small baby pancake and silly looking. Russian-improved tessar ;) That lens has personality.
  Or the Yashinon-DX 50mm/1.7 with it’s silver frontrim, it’s buttery bokeh and sharp details. Made by Tomioka.
  I guess the header for this paragraph could also be “personality”.
  
  

  Industar 50-2 on Zenit ET

• Review of Pentax Super Takumar 35mm/3.5
• Review of Asahi S-M-C Takumar 55mm/1.8
• Review of Yashica ML 50mm/2
• Review of Auto Yashinon-DX 50mm/1.7 m42-lens
• Autumn with Super-Takumar 85mm/1.9