The truth which many owners of ketches don't really want to hear, is that a ketch
under 50' long is not a very efficient sailboat design. The reason is that you end up without sufficient gap between the main and the mizzen. The mizzen becomes a "flap" for the main, much like the flaps on the wings of aircraft. And just like with the aircraft, the flaps give a lot of drag (that's why they are retracted during normal flight).
50' and up, it can start making sense for cruisers (performance to handling ratio) and from 60' up it starts making sense for racers. Those racers are still slower than sloop-rigged boats with the same hull
when sailing upwind, but they are king of reaching.
The tell-tale sign is to look at the back-end of the main boom. If it is very close to the mizzen mast
when in midships position, it will not be very efficient.
So, where does that leave the ketches under 50'? You get a cruiser that is very easy to handle, with great flexibility in sail plans, very good for heavy weather
sailing etc. etc. and all that just for the cost of some upwind performance. When a sloop
with an all hyped up crew working the sails
, shouting etc. while hanging on for dear life, manages to pass a ketch, they might notice that the other crew is having cocktails in the cockpit
while reading a book or hauling in dinner.