I have the Focal Clear and Audeze LCD2C. Used to have HD58X and Amiron Home (similar tech to 1990 pro). so this is my purely subjective perspective (note that I listen mostly to metal and progressive rock):
I haven't heard the Elex, but the rumors are that they are very similar to the Clear. I consider the Clear the best goddamn headphone I know, besides Utopia. I don't see a problem weight-wise, and the overall comfort and ergonomics is outstanding. The sound of course is delicious and very dynamic – meaning the peaks of the waveform (like at percussion hits) are very peaky. That's part of the reason for the "bottoming out" of the driver at high levels of bass – it's limited by the available excursion it has, and have a very hard ceiling on how much excursion it can take. At the limit it does sound like a kind of pop. It happened to me many time when I first bought them, and didn't seem to damage the drives yet. Obviously, I am now very careful with how loud they get with bass heavy content (that means electronic music with huge kicks that goes down to 30-40 hz). So yeah, these aren't bass canons. Bass is slamming and very realistic to my ears, as long as it's not overwhelming the driver. The soundstage/imaging though is amazing, and I think only second to the HD800. Their FR sounds a bit bright for me, so I EQ them to be darker.
The Audeze LCD2C is very different – they can handle ALL the bass. they never clip or even distort no matter how much power you pump through them. bass is insanely deep and clean, though not extenuated in the FR. On the other hand, they have a very dark and mid-centric sound that feels boxy sometimes. I can only listen to my pair through a costume EQ that applies a bit of V shape to the sound to make them more exciting and lively. Soundstage and imaging is less amazing here, to my ears. Comfort wise, they are heavy, though less than all the other audeze headphones. I did some modding and added more cushioning to the strap to make it wearable for long periods of time.
Personally I didn't like the HD58X or any of the other headphones in the HD600 series. I felt the soundstage to narrow and overall sound not exciting enough. The amiron home has some merit, but overall is not a good execution by beyerdynamic. Maybe the 1990 pro is better. I'm not super familiar with the rest of their stuff.
I think you should also consider stuff from Hifiman. They have their own issues with QC, but they can make good stuff.
edit:
Oh, and I also wanted to say that the Clear or much more open the the Audeze. That affects the imaging at the audeze, but also creates more resonances, especially at the bass and mid bass area. The bass is clean distortion-wise, but sometimes can get a bit muddy as resonances build up. on the Clear bass can sound a bit thin at times because it dissipates instantly, but that also means that bass peaks are more pronounced. So there is a give and take here, basically. That's why I have both of them!