Olympus OM Zuiko 100mm f/2 Auto-T

[Nero]

I have one one if these that I've adapted for my X-T1 and it's a beautiful lens, but I'm really feeling torn between this and the Fuji 90mm f/2 which I've tried and really like. The f/2 version of the 100mm Olympus is known as one of their best, but to me it's largely nostalgic versus truly useful so I'm thinking about selling it to offset the cost of the 90mm. I've read that the 100mm f/2 is somewhat rare and valuable, but I have no clear answer on what I could expect to get for it. Anyone have an idea? It's in great condition. I checked eBay and there's only one listed (about $700 I think), but with only one to go by it doesn't really give me a good idea of what to price mine at.