I bought it from the local Video Only, who gave me a hell of a deal (an offer I couldn't refuse). They did have the F8500 and, while they were not side-by-side, I was able to do a comparison. I am by no means an expert, but the image quality on the F8500 did not seem like it was worth the premium Samsung was asking for the television. I mean sure, the picture looked a little brighter, but they were both set to Vivid, something I would never do in my home. Also, from an aesthetic perspective, the VT60 is a much more "attractive" TV in my opinion. Keep in mind that I'll be wall-mounting it, so that single pane of glass look is going to look really cool and different.
I have absolutely no problem with Samsung - I was considering them for my purchase - but I didn't see a compelling reason to spend more on the F8500.