We can not forget price - the Thesonusfaber (official name of the Fenice) costs significantly less than XLF. Four years ago I have answered the Fenice, http://www.whatsbestforum.com/showthread.php?13676-If-Money-and-and-Real-Estate-weren-t-a-concern-what-Speaker-would-you-select&p=249074&viewfull=1#post249074. However having had a large experience with both along several years, IMHO the XLF is a better speaker, although the scale and dynamics of the Fenice are impressive. A good friend listened to them playing rock with six Devialet in monoblock and said it was the closest to being 30 feet from stage at a rock convert in a stadium he has experienced.
IMHO you need at less 5.5 meter room width for them and probably around 8-9 meter length.
Got it. Thank you. I had guessed as much in regards to XLF. I suspect the XLF also fares better in tighter dimensions than the Fenice based on your recommendation above.