I've just bought a B17 for my old/backup tourer. It will probably never be that comfortable, simply because i doubt i will put enough miles into it.
However, the 20 year old B17 that was on it, i have transferred to my new tourer, because after all the miles I've ridden it, it has now conformed to my posterior and become suitably polished. It is now perfectly comfortable.
I've tried modern anatomically marvellous saddles and they feel like fence posts.
The B17 is like a horse saddle, and if you're going to spend all day in a saddle, it's got to be that comfortable.
But that's just the touring perspective.
PS I have a worn-in Brooks on my old mountain bike too, but it is the sprung version of the B17.