I have owned all the headphones you list as owning. All are special in some way. Like some here have said, you may find these are still better that many 'TOTL' headphones. For me "TOTL" or most expensive, definitely does not mean better or even best. Just most expensive. I have listened to, and owned many of the current headphones available. The few key models I have not sampled are: Warwick Acoustics Bravura, Warwick Acoustics Aperio, Abyss Diana TC, T+A Solitaire P, Final D8000/Pro and Stax X9000. I cannot think of anything else significant that I have not sampled. I believe that after you have had the Focal Clear and HD800S, in particular, headphones don't get significantly better. Some newer and more expensive models are just more, different. Not significantly better. With maybe a few exceptions.
Further, I believe that some high end headphones- 1266TC, Audeze CRBN, Stax X9000, ZMF Atrium for example can offer you something different, that nothing else does and that is why you buy them. So if you want that flavor or you gotta have that exact sound, you can only get it with one headphone. Having said all that, I think there are three or four headphones that you may find significantly better in a bunch of categories or different enough in some areas and better in a couple others- Hifiman Susvara, HE1000V2, Hifiman Arya (any) and LCD-5. That is it, if we are talking something that can be called significantly better.
All of the aforementioned Meze and DCA headphones? No. Beauty queens with amazing build quality, but average sound. In my opinion, way over priced and out of there league, in direct comparison to what you already have. I personally don't like the sound of RAAL headphones or any estats really (save the CRBN), but you might. They are certainly different and maybe special enough for you to pay for that sound.