I suppose all commentary about vintage saxes is ultimately anecdotal.
FWIW, the late-30s HN White/King tenor that I was wistfully recalling above had much "better" intonation than my current Martin Dick Stabile. By that I mean it was less mouthpiece picky, and the intonation was less flexible. Crucially, the palm keys on the King weren't noticeably flat, whereas with the Martin I have to work hard to bring everything above Eflat up to pitch. My King had a lovely middle D. OTOH, as with my Martin, it took some effort with the King to play A-Bflat-B-C-C# in the middle register in tune with the same notes in the upper register. Both horns are allergic to narrow chambered mouthpieces, although the Martin somewhat moreso.
Also FWIW, I think the early Kings can be a great--i.e. not too risky--choice. I got mine for $650, which was pretty much equal to the market value of the case, the set-up, and the mouthpiece that came with it. I played it for a year and a half, and then sold it for about the same amount. By contrast, a nice Zephyr goes for around $2500 (two beauties at Worldwide right now BTW); Super20s are of course considerably more. This is sort of apples and oranges, but I really don't see the risk with cheapo King? A 4K Super20 could, however, be a real stinker, right?
Actually, I wouldn't mind hearing more on here about intonation issues on vintage horns.
With the exception of unsuitable mouthpiece choices, I'm becoming more and more convinced that MY intonation issues are just that--mine. Generalizing from my own flaws, I'd say most vintage horns have poor intonation because the player is playing too near to the top of the tone window, biting, or both. What's more, I'm more and more convinced that biting is a symptom not just of bad training, but also of consistently poor reed quality. So many reeds, or even entire boxes of reeds, are just unresponsive, and so I feel I have to bite more than I want to get them going. On vintage saxes especially, I think, this combination throws the intonation off, moreso than on a modern sax like my Yani T901.
Cheers,
Rory