old jmw9 vs new

I am just curious if anyone else has had a direct comparison.  It seems to me that the new jmw 9 does track better but does sound different to me.
How does it sound different? Did you ever get any input on your ? From other sources than goners?
Why make such a little improvement, when you could take a giant step up with the 3D arm if you can mount it on your turntable (you don't say what table you have)