"The decision boils down to 'does a much superior camera outweigh all the other plusses and minuses of both devices."
MRU, I have been following your decision dilemma and have read and re-read your latest pro/con opinion of both phones. I am especially interested because I am on the fence about which one to get with my upgrade.
I may be wrong but I get a strong sense that while you "want" to love the S4, you are really drawn to the One.
I think you probably need to ask yourself how long you normally keep a phone before changing? Are you really going to need to take stellar photos for 18 months, or can you perhaps use your digital camera for those really special occasions that come up?
I think the features that seriously attract you to the One are the ones that you will be using a lot, on a daily basis. A good strong ringtone is at the very top of my priority list, for example.
Just my two coppers
. Now, I need to go the store and play with both and see which one "speaks" to me!