I have owned '07, '09 and '11 GSAs. Never owned a GS until my '13 GS.
The new GS is a better handling and more powerful bike than my previous GSAs. I really like the adaptive suspension. It really make the ESA option worth the price.
The led headlight is great and the cruise control is from Heaven.
I was very frustrated with the problems my '12 K1600GT (hard left pull, clunky and lots of drive slop) had so I sold it and decided to beta test the GSW. So far so good with 2k miles. The problems with the K1600GT were obvious within a couple hundred miles.
If the new GSA has similar agility and low COG like the GS I will look at getting a '15 model.
2014 R1200RT (grounded and out)
2013 R1200GS LC
2013 KTM 500 XC-W