To be honest, I have quite a few excellent lenses, but if you forced me to choose 3, I guess it would be the list below.
Zeiss Loxia 21 f/2.8 (so small compared to my old ZE 21)
SMC Pentax 28mm f/3.5 K
Voigtlander 125mm APO-Lanthar Macro f/2.5 (haven't shot my CV 110mm enough to fully knock the 125 off my list...yet)
I've gotten so comfortable (4+ years of shooting) with the Pentax as my 28mm lens (a focal length I love to shoot), that only the Leica Elmarit-R 28mm f/2.8 tempts me.
One from the Pentax taken a couple of months ago, it's hard to believe this lens is from the mid 1970's.
