I still own JA Perspectives (and hope to upgrade). Love them. But I switch between the JA's and my Thiel 2.7s, and enjoy both. The Thiels in my system are a bit more full and rich from top to bottom with more dense imaging, the Josephs more refined tonally and punchier in the bass. If I ever moved on it would probably to try something like the Devore O/96 - a totally different sound. But then, I like trying different speakers. I'm still happy with my Perspectives.
Why are you asking? You have Perspectives and have the itch to move on, I presume?