The regular K702 does get frequently recommended on this thread to those looking to soundwhore on competitive MP without any regard to immersive / fun tonality. It’s perfect for those who just want a massive, airy soundstage with superlative imaging and separation for locating footsteps etc. and don’t care about anything else.
The K702 anniversary edition of which there are two iterations (different pads) are warmer, smoother and more engaging than the K702. The treble isn’t as harsh and there’s considerably more presence in the low end with very little compromise to imaging and soundstage. They are however, out of production, and as a result you’ll likely pay over the odds for it second hand, more so if you find somewhere offering them new.
. . . But, AKG have since collaborated with Drop (formerly Massdrop) to offer the K7XX which is the closest of AKG’s current models to the second iteration of the Anniversaries. They are generally regarded as being very similar if not practically the same headphones in tonality.
Also, read this. It’s the best (subjective) comparison of the major AKG K7~ models out there:
https://www.head-fi.org/threads/my-...s-and-the-rest-to-stop-this-confusion.752994/
As for 58X vs K7XX, here are the top google search results for K7XX / 58X review videos that compare the two. Both preferred the K7XX (as do I). That being said, I don’t think there‘s a big enough difference between the two for the average user to retain both unless they have a need for two pairs of somewhat similar sounding headphones. If on the other hand, you plan on selling the 58Xs should the K7XX be to your liking, then yeah, as a replacement upgrade, I’d say they’re worth it.