I compared the ZEX Pro with AKG K702/K240 Studio, KZ ZEX (normal version) and KZ ZAS.
DAC I used were Fiio BTR3K and KZ AZ09 Pro.
For the positive things, I love the housing of the KZ ZEX Pro. It's perfectly shaped for my ear, it looks gorgeous (maybe not the biggest fan of this look of the metal plate but the DD needs the extra space) and the nossle has a much better fitting for ear tips.
Sound wise it can deliver good amount of bass. Bit recessive against other KZ but still enough there. The mids could really sound pretty good but there comes my big problem with them.
As treble kicks in the overall sound experience is getting really cheap and washed out. Many details on the treble can't really be represented.
I'm no expert on this topic but I really prefer the normal KZ ZEX. Maybe the graph isn't that flat as the ZEX Pro, but you get a much more entertaining sound out of them. Clarity wise I would say they are about the same ZEX Pro better in mids. Normal ZEX in treble.