MK used one with Gizmodrome on their recent Italy show. With a pick. And he's said recently that he's also started using a heavier gauge string.
It's true that in recent years his tone has become thinner since using the KingBass model, but to me it is only apparent on recorded stuff (the Metropolis gig video is a prime example of this). Live, (as in actually being in the same room with him) his sound has always been powerful, but very different to his Jaydee / Alembic days. From what I've heard of him playing the T-Bass his sound has fattened up somewhat, which is a good thing I think.
It's easy to be cynical when it comes to Mark's association with Status, the countless tweaks on his KingBass being the main reason for this, but remember this: Status did pretty well without Mark's high profile use while he was using his Alembics pretty much exclusively at the end of the 80s/early 90s, players like Jaz Lochrie, Michael McKeegan, and Mike Porcaro were swinging their Statii about while everyone else was going back to vintage Fenders, and Status have always sold instruments regardless of artist endorsement. If I was a luthier and someone as high profile as Mr King wanted to use my basses exclusively, I'd be a fool to turn him down. It's business after all innit? 😊