This is not a new development and certainly not exclusive to Wallstreet or the City or Amazon or magic circle. It is part of the aura of these places—belief that the endurance necessary for this kind of over work isn't present outside and that they are/will be better for overcoming this ordeal— that this makes them different from others this is part of the exclusiveness of these places along with the pay.
But there are many people working equally harder and sometimes even [harder].
Here is another story from less prestigious cousins of WallSt. and magic circle law firms: Big 4 auditors! A PwC associate overworked to [18 hours a day, 120 a week].
[harder] : http://www.theguardian.com/commentisfree/2013/aug/05/woman-n...
[18 hours a day, 120 a week] :
1. http://offbeatchina.com/25-year-old-auditor-at-pwc-shanghai-...
2. http://goingconcern.com/2011/4/did-a-pwc-auditor-work-hersel...