Regrettably, printing technology hasn't progressed much and his camera has way more dr than the final media. He notes we always have to have the client in mind. Magazine editors will reject images if contrast is too high forcing key areas to unintentionally black or white out. This means the dr has to be compressed if you routinely shoot very high dr images and can give a flat look. This is an artistic choice you can make, but just understand that many choose not to shoot or edit this way and value other attributes of the tools we use.
To the OP, I don't see banding in my 6D photos. If, though, a key part of your workflow is lifting shadows as far as you can, the Nikon or Sony will serve you better in that regard.
Funny, this scene has a fairly high DR yet it compressed just fine:
Tomorrowland Aglow by tltichy, on Flickr
BTW, with the clean DR of the current crop of exmor sensors, this could have been done in one exposure.