I guess if you have very specific demands and someone has the car well....
As for timing, the Sport was built from September 2012 onwards so the car in question could have been built in July 2012 and then registered in spring 2013 - not uncommon with expensive cars.
I recently drove a Sport MC Shift with skyhook and I struggled to compute how it handled differently from my car. You have to remember that when companies' facelift cars they have to come up with spin to try and make people upgrade....take it as you see fit.
Personally I don't like the nose on the Sport so that would put me off buying one. I also prefer the black grill on the GTS Auto but that was replaced for the 2012MY with the chrome one you see on the advert. It's relatively easy to change them and which one looks best depends on the colour of the car - it actually looks ok on the car in the advert but would not look good on the dark blue of my car IMHO.