Upload & Sell: On
Thanks, Michael! Thanks to everyone else for the comments as well.
Budget is thankfully not a concern; I can afford either one. My issue is that I'm always heavily biased towards best-in-class products, and that's clearly the 24/1.4. But I'm not much of a wide guy -- my most-used focal lengths are more like 200+ -- so I'm not sure of how much use it would get in the long term. Then there's the little voice inside my head that says "you don't shoot wide often enough, you're missing a tool, and there's more you can learn that'll make you a better shooter".
Lighter, smaller, and much cheaper argues in favor of the 28, especially for travel and a lens I don't use that often. But I print large, and "best" is a big word for me: I'd rather work hard to learn something well than do it "fine". And so I chase my tail.
In this particular case, I'm going to Barcelona for 10 days. It's strictly a family trip: spend time with my wife, and also travel with my father who's 72 and probably doesn't have that many more trips left in him. Simpler is better... this is not a shooting trip. I'm very tempted to take a walk on the wild side and travel only with the 24/1.4. That would certainly provide me with a crash course in wide shooting while not getting in the way of the family.
But then the little voice says, "What if you need 200mm?"