If I had to choose the best SOS of all time, then, no I wouldn't choose one from KTGC, I would probably choose Basel '92 or perhaps A Night in London, but certainly there were very good renditions on the KTGC tour, just as there were not so good ones on previous tours like STP and Shangri-La.
It doesn't seem to have anything to do with MK getting older and his fingers not being so nimble, either because I have enjoyed some of the best TR's on the KTGC tour and his fingers were flying!
If I wanted to hear perfection every time, I would listen to the album, but I don't very much these days. I prefer listening to some of the wonderful recordings from the various tours. They may not be perfect every time, but I find them more interesting.
I also think some folk are looking back through rose-tinted spectacles, saying MK is not what he used to be. Even the much-lauded Rockpalast was not perfect, but it was non-the-less extremely enjoyable and a wonderful show to look back on.
Whatever, the audience always seem to enjoy hearing SOS played and so do I.
Relish the moment while it's happening!