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Actually Jan, I am with you here. Last year (Spring 2011) I once again put myself in the poor house with the purchase of the 100mm L Macro and the 50 1.2L. To date, I don't think they have been out of the case more than 2 or 3 times each; In light of that I have recently been thinking about selling them to to fund the new 24-70L. But after reading your post, you have motivated me to dismount the 500 and put one of the other primes on and stick with that. In fact, a friend and I are planning a day trip in search of old (and abandoned) New Mexico ghost towns and other structures left to weather mother nature. This would probably be a great fit for the fifty, as well as more portraits, pet photos etc.
Thanks for the challenge and the inspiration,
Bob.