The recent lens introductions by Sigma have generated a lot of buzz and good reviews. See earlier post for this topic. For example, the Sigma 35mm f/1.4 DG lens has received excellent reviews and seems to be taking sales away from Canon's venerable but older EF 35mm f/1.4L.
Now word is Canon is testing a replacement to this lens, the EF 35mm f/1.4L II but no release date has been mentioned. It may come after Canon releases a few more wide angle, full frame lenses to round out their EF lens lineup first. Read the earlier post for this topic.