Upload & Sell: On
Owning or having owned every 50 made by Canon and Sigma (I love the FL), to me the EF 1.4 is a great lens provided you get a good copy. My 4th was the charm, all were sharp stopped down but only 1 was really really sharp WFO. Sharper than the L at 1.4.
Also have the 2.5 CM, one of Canon's unsung heroes. Stellar across the frame.
Sigma 50 was fantastic except it's not calibrable, at least none of the copies I tried. Always front or back focused.
If you find that good 1.4 you'll be in hog heaven, as the shots in this thread indicate. Color is great as well, CA is what you'd expect from a fast Canon, L or not.