Right, I've spoken to my friend (well, WhastApp message ..) and he's definitely going to sell between mid October and end of March next year. Likely to be replaced with a KTM SD1290GT.
He hadn't thought about the price but is doing so now. When he's done that, he'll release all the mileage, extras etc. details.
He did say to mention that it is the last K1300S Sport sold in the UK. There were only MotorSports after his bike.
Having owned a Sport and a MotorSport, I think my preference would be for the sport. The difference the cast wheels make to turn in is not noticeable and the solid pegs are bloody sore when they clout your leg when moving the bike around.
As for ESA, I've had no issues with it on either of my bikes, both of which did over 50k miles. My Sport, now owned by a friend, is still going strong with well over 76k miles on it and has had a rear shock rebuild (at about 65k) by MCT. I certainly never felt the suspension lacking and was happy to ride to the limits of the tyres when road conditions allowed. The advantage in being able to switch between sport and comfort as the road conations dictate is something not to be under estimated.