Here are both the Rolex Submariner 126613 newer version and the Rolex Submariner 116613 older version. Both pretty much look the same aesthetically but have minor tweaks to the 126613. The older version looks bigger but has a 1mm smaller case. The shoulders have been made smaller on the 126613 to reduce the overall size and make it look less square. Rolex also added a better movement that has a longer power reserve from 48 hours to 70 hours when your watch is not in use.
The bracelet was replaced with a wider band 22mm rather than 20mm band, bit still feel the older version looks just as good for a lot less money in my opinion. The bracelet looks a lot better being a touch bigger