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When I attended the Leicester event last weekend I reached the same conclusions: the ZT is not worth the extra over the VT, though all sets performed to a very high standard and any owner should be happy with their purchase.
The F8500's higher MLL is noticeable in a very dark room, but the Samsung has other things to recommend it: better 50Hz motion; an arguably cleaner picture and sharper image.
I think we've reached a point now where performance among high end models is so close that it comes down to individual preferences and determining which set is most appropriate for your needs. If you rarely watch TV in a dark room, the Samsung has a great deal going for it.