5000 euros is too much for headphones. Because the higher the price range, the smaller things change. Most high-end brands have their own unique tuning, and everyone has different preferences for sound, so I suggest you go to the offline headset experience store to experience it, and then choose according to your ear preferences.

Definitely try some in person if you want to spend that much. I still use Beyerdynamic ones, seem to spend hours looking at sound systems & headphones and get no closer to buying anything new.

Apart from good headphones, you would ideally also want a good DAC/AMP.

Dragonfly makes the best portable DACs.

IfiZen is a very good stationary option for DAC/AMP. Pretty cheap as well.

Sony SS-NA5ES

nahh you're gonna need more than 5000 for a decent one mate

I would definitely recommend noise cancelling stuff, really like the sony ones...but i would go now for the small in ear ones

NA5ES is good

Sony
Sennheiser
JBL
Samsung.

Would totally go again for the sony wh..whatever noise cancelling headphones

Just migrated to OnePlus Wireless Z Bullets. Again, outstanding bits of kit lol