Exepert? OMG don't ever say that! I hope you're kidding because otherwise I feel like an ass.
I'm a stupid fan boy with too much time who wasted hours of his life reading up on them. Plus I don't speak or read Japanese so Shinnbone has my balls in a vise grip right now.
Are you talking about the Shure 840? I think that was the 2nd headphone I ever owned? A lot has changed since then and I've gone through a dozen headphones in the past 3 years or so and several amps and dacs. My audio memory on the 840 is very fuzzy at best, especially since I didn't really like it too much for the month or so that I owned it. As an educated guess I would think the 7520 is superior in every category you mentioned, but then again they're not even the same price bracket so... but then again the 840 might be good enough depending on your purpose. What will you be using to drive/listen to the 840? What kind of music?
You're too humble my friend.
Well I can get MDR-Z1000 easily here but not MDR-7520. The price for MDR-Z1000 is almost $450.
So far I hear more good thing in 7520 than Z1000.
Several concerns in Z1000 as most of you have mentioned discouraged me from getting it like bass rolled off and also the narrow sound stage relative to 7520.
This is the reason I want to consider alternative cans that the sound signature very close to MDR-7520.
My music taste is very wide from dance, pop, acoustics, vocal, electronic...etc
If Shure 840 is not near to 7520's sound signature, let me know other alternative.
Thanks.