I sold my CV 21mm f/1.8 and bought a chrome 21mm f/3.4 super angulon for about $700 today. Much smaller lens that focuses a bit closer. It's got some moderate haze in it but i'm pretty confident in my ability to take it apart and clean it. Before I do, though, I was wondering if anyone has done this and if it's similar to the older f/4 version or the 35mm f/3.5 Summaron-M, both of which I have successfully taken apart and cleaned in the past.