Hahaha. Rolex vs. GS? Hard to compare the two watches above but here are my general take on Rolex vs. GS:-
1) The Rolex bracelet with the glidelock system is in a class of its own. The clasp is also top notch. The GS bracelet is also pretty well finished with the 5pc link system, enabling each piece to be individually polished. The clasp is however a more simple affair. All in all, Rolex probably shades GS in the bracelet/deployant department.
2) The attention to detail of the GS is incredible! The polishing is of course remarkable and the finishing of the hands, case, markers and appliqués could not be faulted even under a 10x loupe. Rolex looks relatively utilitarian in comparison.
3) The dial finishing on the GS is something to behold. Nothing really special about the Rolex dial.
4) The movement finishing on the GS is also gorgeous. Movement finishing on the Rolex? What finishing?
When it comes to attention to detail and overall finishing, Rolex is not even on the same page as the GS. However, Rolex is not just a name game as it does have its own merits. The Sub C on its own is very well made considering it is mass produced. The bracelet, cerachrom bezel, smoothness of the crown and the iconic design makes it a very desirable proposition. If you are one who appreciates the finer details in watchmaking, the GS will be right up your alley.