I haven't heard the Liutos, so I can't really help.
I have done a direct comparison of the Harbeth SHL5s with the SF Cremona Auditor Ms (which are rather more expensive than the Liutos). I like the Harbeths very much. They're wonderful with voices, and they have a lovely airy quality. However, I found the Cremonas had more punch and a more consistent quality when driven hard.
Cno is right to say that the SFs need a certain amount of space, if the bass port isn't to cause problems.
Matt