I've got two C414B-ULS, and they're great on almost everything except most vocals (but are great on some vocals) - no experience with the others.
I've got an AT-4040, and if it sounds at all like the 4050 in cardioid, then I would probably like the 4050 better for most vocals. But I totally use the 414 in cardioid over the 4040 for overheads, acoustic guitar, percussion, anything I have no idea how to record, etc.
resonancestudio, you're right - they generally have two models, one for vocals and one for everything else (the B-ULS was for everything else) -- I think the vocal versions are tuned with a mid-range bump, but I don't have one of those
I've got a KSM-27, and I've read that the capsule is similar to half of the KSM-44 dual capsule thing, but those who have tried both seem to say there's a big difference. I'm not in love with the KSM-27, but it's OK on acoustic (like the 414 much better)