Heh...you never know about public perception with regards to paphs and the psychos who grow them (we psychos in general have earned that reputation in my estimation). It always amazes me, just in the realm of orchid judging, how a superior blooming can get an otherwise decent but by no means truly spectacular clone a high AOS award, which then influences breeding trends, price, "desirability", etc. You also see this with certain clones that have already been awarded years back, and then someone grows it into a nice specimen, everything is larger and more vibrant, and you get the award "upgraded". I'm not necessarily critical of this, awards are given to the plant on the table without strings attached, but it just goes to show you that there's much more to a "superior" plant than a nametag. And that definition of superior is very subjective. I happen to like my dorsal sepals flat and my vandas resembling dinner plates, but there are those who disagree. Interesting discussions.
I think I'm rambling. Back to the case in point, I suspect that certain plants are more homogenous in their bloomings, while others may vary to a much greater extent. A plant like a Paph. Clair de Lune 'Edgard Van Belle' always looks the same, but take something with wavy margins like the petals of a Delrosi, and I'll bet that the pattern changes every blooming, and maybe even flower to flower on the same spike.
At least color should be more constant. But then again, yellows/greens and reds can be manipulated to some extent by light level, and it's pretty much across the board that the red phrags are much more vibrant during cool-weather bloomings (anthocyanin pigment is enhanced by cool temps, if I recall).