Just to echo what G-BOAC has said about not expecting too much. I agree that if you have already flown longhaul Business Class with any of the major airlines your first trip in F will not be so much different.
Mine wasn't, although it was a great experience I wouldn't be in too much of a hurry to repeat it to be honest as I don't think it is worth the extra cash or miles unless for a special occasion. I found my first longhaul trip in Business Class far more exciting having been used to travelling in Economy.

The best part of travelling in F is the anticipation of doing it, so enjoy the lead up to it, get to the airport with plenty of time to spare, relax and take it all in.

Remember to take some pics.