I don't think so, at least where the unmistakably large-sized sonic radiating surfaces of the K-horn and La Scala are concerned.
I believe Heyser's classic article on the K-horn cited very low distortion figures; are comparative distortion figures available?
Heysers "classic" article is unfortunate,......he hand drew the bass horn response shown in the frequency magnitude plot.
Heyser was a smart guy, no question, but he was also PWKs buddy and was unlikely to provide an unbiased analysis.
He was unable to make accurate measurement of the bass horn in the confines of his living room thus the hand sketch representing the LF section of the response.