FWIW I was unimpressed with the Arias and Kantas that I've heard, but loved the Sopra. I haven't heard the Electra, but I imagine it's closer to the Sopra than it is to the others. If you can get an Electra for the same price as the Arias, I'd just on it.
Focal Aria 936 vs Flectra 1028BE
There does not seem to be a big difference in price for these on the used marketplace, perhaps $1,000 - $1,500 or so. How do they compare sonically? The latest offering from Focal ( The Kanta) uses the flax cones of the Aria vs the W cone used in the Utopia, Sopra and Electra line. And the Electra also has the Berillium tweeter. Any thoughts on which is the better buy used?