What generation is this device?

Hi, hope the day is treating you well. I am curious what headphones are considered a considerable and worthy step above Sennheiser HD 600? HD 600 are my favorite headphones ever so far (I tried most of the popular options within 500$ USD price range). Something with a neutral signature, considerably more resolving. Would it be Focal Clear? Sennheiser HD 800S?

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Most comfy headphones I Own.... super warm sounding but maybe an acquired taste

I've been eyeing the Meze 109 Pro's now for a while & have done research comparing my current daily driver the Dan Clark Aeon 2 Open (not the Noire version), which I love! Would like to get opinions on whether it's even worth it to pull the trigger on the 109's or am I really just getting what I already have? From what I gather so far, the 109's are going to just be "slightly" better but would love to get some honest opinions from those who either have both or who have tried both or maybe you're very good at understanding the numbers for both & can provide some insight? Thanks guys!!

Azymuth – Águia Não Come Mosca (1977), with AT-VMN95ML stylus.

Any travel case recommendations for the Sennheiser HD58XX? thanks, Brian