I really like(d) my 135/2, which I have used along side my 70-200/2.8II and 85/1.2II.
A couple of weeks ago, I dropped it on a tiled floor. Got enough internal damage to put it to final rest (CPS assessed repair cost to equal a new lens). First thought was to buy a new one, but I realized that with the other two listed above, I am able to shoot all the things I want to shoot. The 135 draws less attention than the 70-200, but I can´t say it bothers me. I have always enjoyed the 85/1.2II more and now that lens is being used more instead.
The 135 is a great lens, which deserves all the acclaim it gets, but I have decided to live without it. But if an IS version with equal/better IQ comes along .... mighty tempting ...
1DXII, 5DIV, 5DSR, 8-15/4L, 11-24/4L, 16-35/2.8L III, 24-70/28L II, 70-200/2.8L IS II, 100-400/4.5-5.6L IS II, 200-400/4L IS 1.4x, 17/3.5L TS-E, 24/4L TS-E, 35/1.4L II, 100/2.8L IS Macro, 300/2.8L IS II, 600/4L IS II, Zeiss: 15/2.8, 35/1.4, 55/1.4 Otus, 85/1.4 Otus, Profoto B1