$500 for headphones is fine, if they would last 20 years.
AirPods look like flimsy plastic stuff. For portable heapdhones they are not water resistant, do not fold and not even come with hard case.
And given apple, there will be no spare parts and manuals.
Right - I gifted a pair of MDR7506s to my girlfriend the other day.
I love that they include an insert telling you exactly how to take the entire headphone apart - I don't think I've owned a pair like that before.
But, I broke out my B&O H6s to do an A/B test after giving them to her, and I think it was a mistake? The H6s are of course in the next higher price price bracket, but the 7506s did not compare musically to them at all.
As much as I appreciate the repairability of the 7506s, I think would recommend something a bit more musical as a daily driver.
The Sony is basically flat (by mass-market standards), with a little emphasis in the "presence" area, 3-4.5KHz.
The B&O adds a bass boost from 20-50Hz, and then an upward curve from 400Hz up to 3.5KHz, then a bigger bump from 6.5KHz and up.
From that, I expect you found the B&O to bring a deeper thumping bass and a sparklier sound to cymbals. It's almost certainly more exciting than the Sony.
I wonder if they'll end up sounding like beats?
[0] https://news.ycombinator.com/item?id=23826070