TK got it right during the all too short days of their F service... The riff-raff in C were kept behind whilst you were whisked to a golf cart, which was driven at break-neck speed through the airport by a winsome young person who let you wait in your seat whilst they got your passport stamped, then drove you through customs to baggage claim, and then to your (free) limo that took you to your hotel.

Sadly, they didn't manage to provide and sell a consistent product in other ways, and First Class on TK is no more.