Well, I do have a few good Canon lens, but I must say I use them less and less. I haven't used /any/ for weeks. Some for months now.
For example : the Canon 85mm f1.8 is nice and indeed a lot sharper than the Jupiter 9, BUT it also has massive purple fringes wide open, and is massively bigger & heavier. The Jupiter 9 is smaller than Canon's 50mm!
On the 50mm front, it's more of the same. I got 2 f1.2 manual lens (faster than my canon) that I find excellent, while being more compact. Not counting the few f1.4 ones that are totaly brilliant like the Takumar, or the myriads of f1.8 ones 
So yeah I KNOW the Canon is a great lens, but if I don't have to track my subject, I can pick any of these manual ones and get (at least) an equivalent result.
Wider, well, the Flektogon is /glued/ on the camera most of the time, and if I want wider, I have the Sigma zoom.
135mm well I have so many good ones it's hard to pick. the Canon is fantastic, but it's also massive, quite frankly if I don't have to track subjects I'll pick a manual. The Zeiss or the SMC Takumar, or the Pentacon... But then again I might just pick a tiny 105mm.
200mm I rarely use after all. But strangely enough if I have to use one it's the Canon. I have a couple very good manual 200mm, but they are not any smaller than the L.. so...
So it's all a question of convenience. I feel I can carry a small compact 135mm in my bag all afternoon and not regret having picked it if I didn't get to shoot it. That's not true on the Canon (not only that, but I have to carry the massive shade too :/)