I haven't heard much difference, if any, between the 907 and 909 models but the European wood is definitely better. I think when it comes to quality materials, you need to think long term. All these instruments get better with age and I've experienced it a number of time. I'm not talking about 100 years down the road but already a big difference after say 3 months. Continues to grow during the year and with less noticeable difference gets better and better forever. That being said, they sound damn nice to begin with.
As far as Strad and Guarneri comparisons, I would agree that the Guarneri model is darker sounding. And yes even the copies. The templates are slightly different. Graduations are not exactly the same. It's more a tendency though. There are exceptions.

If you decide to purchase your MJZ from us, let us know when the time is right and I'll test the ones that are in stock. Sometimes the Strad projects more and sometimes the Guarneri projects more. I'd say honestly that the differences are very slight while the differences from one particular violin to another differs more. Even if two violins are built by the same maker at the same time using the same wood from the same tree, the violin will have it's own character. Though they are consistently great, I have yet to witness exact same results from a batch of MJZ's.