Both me and Chuck easily found the right eyecup position with SF 8x32. Mine have been on my work station for several days so I could grab quick views of birds flying by or in the tops of our Hawthorn trees so I am often twisting my body round quickly while sitting in my chair at my computer and by no means in a good position to accurately line up the SFs....
That's with the 8x32 though - the 10x32 could conceivably be more finicky, what with the smaller exit pupil etc...
I would say the biggest difference with a dialyt versus modern stuff is contrast...this seems to be where most of the coating improvement have been manifested. I like the view through mine but it doesn’t have the same contrast pop of good current glass.
I think the 7x42 is better in this respect than the 10x40 (both P models). The 7x42 has the more "contemporary" (in your own words) view - brighter, more neutral colour rendition and yes, I'd agree more contrast. The 10x40 is better packaged but the 7x42 has a better view. A shame Zeiss never thought to combine the best of both words in an Abbe-Koening 10x42 T*P* Dialyt, packaged like a longer-bodied 10x40...
I agree that not just the 7x42 Dialyt but probably any 7x42 is going to find it hard to impress one who already owns and likes the 7x42 FL. The 7x35 Retrovid is actually remarkably competitive with the 7x42 Dialyt if my experience from about a year ago trying the two, one after another, is anything to go by.
The 7x42 d***o owned, incidentally, was not a P model and for all we know might not even have been a T asterisk (I can't add the symbol without screwing up the formatting). Still good enough to find "tons of warblers" in late February in Colorado though...