Are you referring to a 2013 Mk6 GTI? I'm not aware of any updates for MY13 that changed the mount points etc (and I would be very surprised if they had changed), and the mechanics of cloth and leather seats are the same. If you're referring to a Mk7 however... all bets are off.
With respect to the quality and feel... they're the same as the leather in any other Mk6 GTI. The seat material is largely synthetic (maybe only 60% is genuine leather), and isn't of the highest quality, but it depends on your expectations as to whether the Golf "Vienna" leather meets them. Check out a Mk6 with factory leather at a dealership if you want to know what the leather is like. It's a very common option.
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