No I haven't heard the Clears, just the Utopias, and the Utopias were the only Focal headphone I had heard before the Elex. I think the reviews online and on Youtube are accurate. The more they run in the better they sound, they can shout a little at the start but after running in they seem better, but I shouldn't be listening at those levels anyway. I think a high impedance output amp helps with the bass but it doesn't really need it. Sound stage is good.
I did pick up a used pair that was only a week old. The cables are very nice but stiff as hell and can be annoying.
One thing for sure, the Elex and Utopias pair very well with a Woo Audio tube amp. A friend tried his Utopias on my WA22, he bought one the following week.