I started with the 35L, superb lens, but when the Sigma 35 Art came out and was even better (less CA and a tad sharper) I sold it for the same price and had a totally new and better lens.
Also beacause it was very old and the Sigma came out, I expected that the value would drop.
I started with 35mm for conceptual modelshoots with also an impressive location in the picture, but I noticed models like more close-ups.
Then I bought the Sigma 50 1.4 Art which extremely sharp, had better bokeh and 50mm is more interesting for halfbody fashionshoots.
When I had to shoot a wedding (for once I think?) I sold my 35 Art for the Tamron 24-70 2.8VC.
This lens is great and almost as sharp as the 24-70 2.8L II for a fraction of the price with VC.
But i'm not so into standardzooms, sometimes I think selling it back for a 35 Art, even if I have the 50 Art which is close.
Now and then I shoot miss elections, so 24-70 + 70-200 is a great combo.
Sometimes I miss the 35L as i'm so used to fast primes with bokeh, maybe I'll sell my 24-70 again sometime...