Jake, that's funny, because my reaction was exactly the opposite. I thought the FPMs sounded very good but when I heard the Artisons, I thought it made the FPMs sound thin. To my ears the Artisons had a much fuller sound. The dealer agreed even though he carried both and the FPMs are more expensive. We tried both with and without a sub, playing the same material. It just shows how subjective the whole speaker thing is.
P.S. Listening again, I'm a bit concerned about the integrity of the center channel effect. Comparing a newscast for example, the dedicated center channel speaker seems to provide a more believable 'anchored' feeling than the Portraits' attempt at creating that center channel effect.