Upload & Sell: On
It makes me sad that the 85 debate is so potent on these forums that this guy feels guilty for owning a truly spectacular lens. On most forums people dream about the 85L and then rejoice when they purchase it. Everyone congratulates them and tells them to have fun with it. Some even express envy. But here just mentioning the 85L reinvents the debate.
I understand your point, but he did ask. :-)
It is a good question, and there is no universally correct answer. As I wrote earlier, the 85mm L is known to be a really wonderful lens. But wonderfulness can be measured in more than one way. For some it come simply from possessing gear often described as wonderful. For others it might come from obtaining gear that is the most useful in their photography.
With lenses like the L primes, it is a real question whether owning one of them will do more or less for your photography than owning, say, 3-4 very good non-L primes whose performance is also quite good. Or whether a good zoom that covers the same focal length range might provide more utility and image quality that will be essentially the same for ones personal style of shooting.
I know I sound like a broken record (or a looping sample?) when I write this, but it isn't about owning some lens labeled as being "The Best." Such a thing doesn't exist. It is about owning the lens that is most effective at accomplishing the things you will use it for.
Going with the "saddens me" theme of the previous post, sometimes it "saddens me" to see a person so caught up on Lens Lust that they end up investing huge amounts of their limited funds in a single lens because it is Really Big and Expensive and Everyone Says it is Great, when this lens won't actually make any difference in the quality of their work, and when in some cases the alternative might have. (I'm not evaluating whether or not the OP falls into this category, just commenting on the general issue.)